double-book
verb [ I, T often passive ] uk/ˌdʌb.əlˈbʊk/ us/ˌdʌb.əlˈbʊk/
同一房间（或座位、票等）被预订给多人，多重预订
to promise the same room, seat, ticket, etc. to more than one person or group
The room was double-booked so they had to give us a different one. 这个房间被重复预订，他们必须给我们另找一个房间。