I immediately discounted the whole "Uh Huh" "Hmmm" thing as just a cheap psychological trick - a way to humanize the interaction without requiring much effort at all. As for the rest of it, I didn't necessarily tag it as fake but I did recognize that the act of making a reservation is a fairly structured process, requiring the exchange of a few critical pieces of information in a quick and efficient manner. But not necessarily something to be bowled over by, and no doubt something well-rehearsed in this case. Given the choice, though, I will generally always go online to take care of something like this rather than interact with a human anyway, since there's always the possibility that they will just screw it up on their end.

BTW, I have no particular reason to trust (nor distrust) anything Google says or does.