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"reservation" is also used as a crossword clue. If that's what you saw, the answer is often booking (7 letters).
Definitions
the act of keeping back or setting aside for some future occasion
Word origin
From Middle French reservation, equivalent to reserve + -ation.
Used in a sentence
“The committee authorised the reservation of funds.”
“I have reservations about your intentions.”
“I have some reservations about cosigning a loan for him.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Booked table”11 letters
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