The only Chatbot I've semi-enjoyed interacting with was SiriusXM during my latest yearly try to cancel dance they make you go through. Usually this was a 45 minute to an hour phone call with Customer Support to eventually get a cheaper rate and continue service.
This last time, it sent me to a Chatbot. In five minutes, I got a cheaper rate than I was previously paying. I'm sort of looking forward to the next interaction to see if I can get even cheaper rates or finally cancel the service.