With the advance notice, you can configure how much in advance you need to know about a booking in order to be able to prepare everything. Here you can also set up that if a booking doesn't meet this requirement you will still receive a booking request and can decide yourself if you still want to accept this booking or not. Some OTAs (Online Travel Agency) support this setting. Find out what to do for Airbnb Professional, Expedia, Booking.com, HomeAway/VRBO.