I'll believe it when I see some evidence. I sure as hell would prefer a form. Have you ever used one of those "automated assistant" phone systems? It's a horrible, slow, patronizing experience.
The ability to enter information out of order. The ability to correct my input afterwards. The ability to potentially provide autocomplete for the flight numbers based on previous inputs. The ability to disable submission if the user-provided inputs are known to be wrong before submission. I could go on, but I think you get the point.
You just added a chatbot and forgot about it. And you have situation like flight delay, that open messenger and use chatbot.