Reservation
A reservation was an arrangement to have or use something at a particular time.
In 2000, when Henry Janeway playfully suggested dinner in Paris to Shannon O'Donnel, she asked if they could get a reservation, it being Friday. Henry said he could arrange it, as he knew the maitre d' (himself). (VOY: "11:59")
In 2374, Miles O'Brien offered to pay some people who had a reservation for their holosuite in order to have another half hour with his daughter Molly, but his offer was declined. (DS9: "Time's Orphan")
In 2377, after arguing with B'Elanna Torres, Tom Paris asked Harry Kim if he needed a reservation (to sleep on his couch). (VOY: "Lineage")