We'll need to rent a car for an unexpected visit. We come in on a 9:00 p.m. flight. I've seen the rental booths there at the baggage pick-up area but will they still have people working at that time of night? I assume the cars are in the parking garage. I guess what I'm asking is if I'll be able to pick the car up that night or if I'll need to come back the next day? Thanks.