@Fredrik50 You can't simply pass on booked guests as if they were part of the furnishings. Guests book to a large extent on the basis of ratings and reviews. While you may be a great host, guests have no way of knowing that. A new owner/host might turn out to be one who doesn't maintain the property in good shape, doesn't deal with guests well, doesn't make sure the cleaning is well done, doesn't provide all the amenitiesthat were listed when they booked.
Guests must be informed of the change of ownership and host, and given a choice as to whether to keep the booking or cancel, in which case the previous owner needs to refund them in full.
Airbnb may assist in transferring the bookings, but they may not.
A home owner, when selling a house they have used for Airbnb, is only selling the house. What the new owner does with it is up to them. You can't sell an Airbnb business. The business belongs to the host, not the property.