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Should Your Chatbot Talk Like a Human?

Colorful illustration of several people and a robot with speech bubbles above their heads.
Making chatbots appear more human requires many more advancements in machine learning and natural language processing. [Tanyabosyk/AdobeStock]

Designing bots to have 'personalities' may affect the quality of your customer service. Consider these best practices.

A recent consumer survey found that 76 percent of respondents would stop doing business with a company after just one bad experience. Reasons include high prices, rude agents, long hold times, and too many transfers. A bad bot experience can just as quickly upset a customer.

Even when a chatbot clearly states it’s a chatbot, people still respond to it as if it were a human agent. How many times have you talked to your device’s voice assistant as if it were a friend or cursed it when it made an error? So if your company wants to build a chatbot, you might ask: Should the chatbot talk like a human? The answer isn’t what you might expect.

As a conversation designer in Salesforce’s user experience group, I’d argue that it’s not about making AI more human. In fact, when bots look and behave too much like a human, it can result in an unintended eerie or creepy quality – the so-called “uncanny valley.” Instead, we need to make bots less robotic. Let me explain the nuance and share how we approach designing bot conversations.

Conversation Design is the Future

Still learning about how to design for conversational AI? Read more about best practices, ethical considerations, and more.

Chatbots should be helpful

Bots are designed to address a specific scope of use cases. For customer service chatbots, the goal is to help the user get answers to questions or resolve an issue. But, if the bot talks like a human, it might cause the customer to expect responses the bot isn’t designed to offer. Giving bots a “personality” and the ability to have more human-like conversations might come at the expense of good customer service. Expanding the bot conversation beyond the intended scope creates extra burden on the design – it’s difficult to account for all the possible requests or questions a customer might have. 

So, instead of focusing on creating a human personality for a bot, consider reframing how you design bots and center on its conversational look and feel to guide your users toward what can be done.

Language design for chatbots

Our team works mainly with chat, so we focus primarily on language design from syntax to diction. Some elements and components of conversation we must consider: 

  • Level of diction: The level of vocabulary and formality of the bot’s language. Use of jargon may leave certain users out, but with a specific, skilled audience in mind, it could also speed up time to resolution.
  • Length of turns: The amount of messages and time your bot sends dialogs before a user responds. Keeping this low keeps users engaged, but it can be tough to do so with complex issues.
  • Emoji use: Whether your bot uses emojis or not, and which emojis are acceptable to use. This can also be an accessibility issue for screen readers and also emojis that may be interpreted in a variety of ways, such as hand signs.
  • Punctuation: Which symbols your bot uses and when. Exclamation points might be used for emphasis or celebration.
  • Bot name: The name of your bot can set the stage for how it’s perceived as a brand. We generally advise designers not to use gendered or human names. The same goes for the bot avatar, or the bot’s profile image.
  • Apologies and celebrations: When a user is successful, how does your bot handle it? What about with unhappy paths where a user’s need wasn’t met? You might end with a simple OK or take the time to tailor conversation to empathize with the user.
Image of different versions of a greeting. The recommended version is: "Hi, Lisa! I'm CareConnect, a chatbot. I'm here to help you support your patients in their health journey."

How a chatbot sounds

Voice adds another layer to how one perceives personality. Some include:

  • Pitch and tone: The general voice of your bot. Often, voice assistants get higher pitched voices.
  • Speech rate: How rapidly your bot speaks. For instructions, you might include extra pauses. Calming meditation apps could speak more slowly.
  • Discourse markers: Words or phrases that signal shifts in conversation. These are also used in chat to acknowledge users. For example: “Got it!” or “OK.” or “So…” to demonstrate different levels of excitement and focus on the user’s goal. “So” indicates another task to be done.
  • Dialect: Similar to pitch, dialect is subject to different cultural perceptions. Across different languages, certain dialects may seem like a standard variant that may be considered more professional.

Another aspect to consider is that users often gender language on their own. We don’t recommend designing bots with a specific gender identity, because it reinforces stereotypes around communication. It also doesn’t meaningfully influence syntax and flow. You might consider giving your bot a more neutral pitch and tone – though it depends on what messaging you want to express through your product and brand.

Beyond these factors, think about overall conversational flow. This might include: timing of bot response delay between messages; how to make dialog variations appear more intelligent and engaging; and disambiguation for error handling. While this isn’t an exhaustive list, it gives you an idea what a conversation might look like versus an image of what a human version of the bot might be like. 

To be or not to be human

So many people are enamored by the concept that bots can be human. But to do so would require many more advancements in machine learning and NLP (natural language processing). The same goes for bots built with advanced large language models. To use these models, we need to define guardrails for everything from conversational techniques to human emotions to service use cases.

Even with live service agents, teams use guidelines for how to assist customers and templates for how to respond in different situations. We have much to learn about how best to address concerns about ethics and bias related to training AI.

Just because we can make bots talk more like humans, doesn’t mean we should.

Portrait of Jason Luna
Jason Luna

Jason Matthew Luna is a conversation designer in Salesforce’s UX organization. His work in modularity and intent training focuses on bringing scalability, consistency, and inclusivity to Salesforce’s chatbot experiences.

More by Jason

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