Sadly conversational UI is poorly implemented(studied?) area of UX. Even more than text it could be the most intutive way we communicate, far better than GUIs, however the space has been ruined with bad products promising the moon without putting effort to the buyer and delivering nothing to the user.
You could build chatbot with just a lot of grunt work and if else conditions and basic language parsing. Sadly no one does that , most chatbots today are low effort solutions that basically ingest random content and expect the model to learn and magically solve problems, which ofcourse does not happen as the model doesn't actually understand anything.