Ask HN: A 24/7 Instant Phone Concierge

I've been floating this idea around my network, and although it's relatively easy to set up, I'm not sure if there's a market for it. It's something I would probably use since I travel a lot, but I've heard mixed responses.

Basically, it's a 24/7 phone concierge that you can call to do stuff like make reservations, call you a taxi, recommend a restaurant, book you a flight or hotel, etc. Real life agents on the phone that pick up instantly. Like Exec, but over the phone. Like Onstar, but for your life. Like Siri, but human-powered. Agents are highly trained and can do anything for you, as long as it can be done legally over the phone.

Questions:

1) Is it worth trying to focus this service into one vertical, like travel, much like American Express (who provides this service as part of their Platinum Card which is where I got the idea), or are you better off calling it the "Call anytime, do anything" concierge?

2) I'm thinking the ideal consumer for this product would be the same market of Exec and Uber--upwardly mobile professionals with disposable income and no free time.

3) Thoughts on price point?

4) Anyone doing this out there? I wasn't able to find anything exactly like this other than the AmEx service (which leads me to believe that a company search engine might be a good product to build as well)

Thanks for your feedback!