You can set booking reminders easily when its required:
Go to the "Settings".
Click on the "Booking Settings".
3. You can Enable / Disable the Booking Option anytime, also there are some other settings that can be used for bookings according to requirements.
4. Under the Booking Reminder, Set Reminder Day / Hours.
5. Click on "Save Changes".
Additionally, for your reference, below is the video tutorial.