The verb reserve means to keep something for a specific time or plan.
Synonyms are secure, save, retain, or preserve.
The word origins from Old French (12th century) reserver meaning “set aside, withhold” and directly from Latin reservare meaning “keep back, save up, retain, preserve”. It coms from re– meaning “back” plus servare meaning “to keep, save, preserve, protect”. The meaning “to book” is from 1935.
I can reserve that seat for you!
She called to reserve a table for seven.
Do I have to reserve a ticket?