To be fair, you can kinda talk to Google assistant in a "question response" type capacity and it does pretty well.
Google Assistant, Apple Siri and Amazon Echo are all quite fancy natural language parsers. After parsing, it's just a group of "dumb" (wo)man-made widgets.
Which is a really weird and nebulous thing to define, by the way. I think we aren't going to have super convincing cognitive computing until we have something approaching AGI. Which of course is waaay different from the AI and machine learning that is popular today, despite most laypeople conflating any mention of AI with AGI. Of course, when IBM is making an ad, they are largely aiming at laypeople.
Also we (science) know shockingly little about real dialogs and their challenges as far as I can find out - but I am not a linguist and am angling here fore some killer references !