From the episode, “The Alternate Side”
Jerry: I don’t understand, I made a reservation, do you have my reservation?
Agent: Yes, we do, unfortunately we ran out of cars.
Jerry: But the reservation keeps the car here. That’s why you have the reservation.
Agent: I know why we have reservations.
Jerry: I don’t think you do. If you did, I’d have a car. See, you know how to take the reservation, you just don’t know how to *hold* the reservation and that’s really the most important part of the reservation, the holding. Anybody can just take them.