o·ver·book 
(ō′vər-bk)
(ō′vər-bk)v. o·ver·booked, o·ver·book·ing, o·ver·books
v.tr.
To take reservations for (an airline flight, for example) beyond the capacity for accommodation.
v.intr.
1. To take reservations beyond the capacity for accommodation: a restaurant that regularly overbooks for dinner.
2. To take on more social engagements or other commitments than one is capable of fulfilling.
o′ver·booking n.