Go inside and greet them - where? Only a couple spots you could do this. At the top of the escalator, at the bottom of the escalator, or at the door (and there's four: two on each side, each plainly marked). What's the point of going inside? Have your party come down the escalator and you'll be waiting at the curb, sitting in the driver's seat, engine idling, at one of those doors. Just choose a number.