Wirelessly posted (BlackBerry8703e/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/104)
I'm just waiting for this scenario:
OP to lobby attendant: "Call me a taxi."
Lobby attendant to OP: "OK: You're a taxi."
But seriously, if I were contemplating requesting that the building's lobby attendant call a cab for me, I would probably ask
when I entered the building if the attendant will be able to secure one when I am ready to leave, or if I need to ask the business I am visiting to do so.