This is an important topic when designing a chatbot. That's why recommend letting people know upfront that they are communicating with a chatbot. The Photography Enquiry Bot has this feature in the welcome message, plus it also includes a feature to talk to a human if required.

The Photography Enquiry Bot is designed to give you prospective clients the information they want, when they want it - and who doesn't want that? But of course you will get some clients that just want to talk to someone now. The Bot allows this, with a friendly message to let them know that you [...]