When you are selling it's always best to only open you're calendar for a few months ahead so you don't accept bookings you know you may not be able to honour.
The listing belongs to you and cannot be transferred as this would be unfair to your guests who booked on the basis of your reviews and how you manage your listing.
The new owner needs to set up their own listing and you need to snooze your listing or block dates so you don't accept new bookings.
You need to contact Airbnb and ask them if guests are happy to go with the new owner can they help transfer the booking.
you may face fines for each guest you need to cancel @Martin3817