@Johanna248 you can set a limit on when you will accept reservations. Go into edit your listing, then into the availability. The first section that you see will have reservation preferences. Go into the advance notice & select 1 days notice, if you want to have a day's notice (guests can still book up to midnight the night before they arrive). Or you can select a longer time for advance notice, or if you are comfortable with same day booking & check in you can cut off the booking time at 6pm (or whatever time suits you).