reservation

An unstated doubt that prevents you from accepting something wholeheartedly.

A statement that limits or restricts some claim.

“he recommended her without any reservations”

A district that is reserved for particular purpose.

The act of reserving (a place or passage) or engaging the services of (a person or group).

Something reserved in advance (as a hotel accommodation or a seat on a plane etc.).

The act of keeping back or setting aside for some future occasion.

The written record or promise of an arrangement by which accommodations are secured in advance.