reservation
US /ˌrez.ɚˈveɪ.ʃən/
UK /ˌrez.ɚˈveɪ.ʃən/

1.
an arrangement to have something (as a room, table, or seat) held for your use at a later time
:
•
I made a dinner reservation for two at 7 PM.
•
Do you have a reservation under the name Smith?
2.
a feeling of doubt or hesitation about something
:
•
I have some reservations about his plan.
•
She accepted the offer without any reservation.