I've used th Visa Signature concierge on several occasions. A few examples

1) They were absolutely awesome for taking care of Japan Rail rail passes. The concierge actually walked over to the JR rail office to pick up the passes and then fedexed them to me free of shipping charge.

2) This summer we were driving across the country and needed a relatively clean hotel to stay at with our dog. They found an amazingly clean nice Hotel that was well reviewed with a reasonable pet fee. They met my constraints of a $50 or under pet fee and a non-scary hotel...that was just off the interstate within a 200 mile range on an interstate that we were on. It's relatively difficult to find a decent (I.e non Motel 6- ish hotel) that doesn't have a $75 plus pet fee. Our dog basically sleeps all the time on his bed on the floor... so I was relatively adverse to paying more than a $50 fee. DW is skeeved out by budget roadside hotels...so finding a place involved a bit of work (calling hotels about the fee etc.) They weren't as good with the second pet friendly request.. But the Hilton diamond desk had me covered.

3) Before the days of Internet on my phone I'd call them to google something when I was on the go.

My general rule of thumb is to spend 5 minutes on google. If I can't figure out something then I turn it over to them. If language barriers cold be involved then that's another good reason.

I would expect that you are better off buying airline tix on your own unless something exotic is involved. If ou are going some place, you can ask them for suggestions of things to vis and places to dine..but I prefer a good travel book.