booked
v.v. to reserve a seat, a room, or a ticket in advance. You do this when you want to make sure a place is saved for you.
v. to reserve an accommodation, service, or ticket in advance. Transitive — requires a direct object representing the service or space being secured.
I booked a table for two at the restaurant.
She booked her flights months in advance to get the best price for her summer holiday.
The conference organisers have already booked the main hall for next year, ensuring that the venue remains available during the peak season for international events.
The verb is transitive and takes a direct object. In British English, it can also mean to officially record a person's name for a rule violation, especially in sports.
I booked for a roomI booked a roomBook is a transitive verb; you book the item directly rather than using the preposition 'for'.