What would be great would be a unified car ride app which accessed all vendors. The AI layer adds nothing, I would say detracts actually, and it would not be more popular. UI is just superior to chat in many, many applications.
I don't have any kind of agent set up to do that now, but to me that sounds like removed friction even if I use it just a few times a year.
I constantly use the Ask AI thing in Google maps to tell it a complex route involving biking and transit and needing to be at a certain place at a certain time. It hasn't messed up on me yet. I would much rather specify the question in natural language than type anything into a rule based UI. In fact I built a toy app years ago that handled a few of my most common queries with the Maps API and I still never used it because of the friction.
siri is horrific