reservation - noun

a district that is reserved for particular purpose

a statement that limits or restricts some claim

an unstated doubt that prevents you from accepting something wholeheartedly

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

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

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

reservation - thesaurus

booking   qualification   reserve