One thing to make it less annoying for the human on the other end is if the AI just talked a little faster and responded a little faster. Also the the final few few seconds is so cringe where the AI always wants to have the last word. Can you make that last part of the interaction go faster? I would never have 3-4 back and forths on thank yous and good byes.

The future way to detect it's a human, and not an AI? No politeness. The person on the phone is yelling at you like a 1950s New Yorker.