I found myself on the receiving end of this product recently, and I felt like I was in a weird pseudo-uncanny valley. What would this AI understand? Would a person read it if it was unparseable by the current system? What if I wanted a little nuance in the conversation, something like, "What's best for me is 1pm on Monday, but if that's a hassle for the other party, I can make Thursday afternoon work"?
Human assistants can handle that just fine (and in fact, is a hugely valuable skill in good admin assistants), but I felt uncomfortable interacting with a system where I didn't know what was possible.