@Doreen31 I'm not entirely sure what you are asking, but it sounds like the cancelled bookings might be blocking your calendar?
If that is so, are you the one who cancelled the bookings?
If a host cancels a confirmed booking, the blocking of dates is part of the penalties applied for a host cancellation.
https://www.airbnb.com/help/article/990/i-m-a-host--what-penalties-apply-if-i-need-to-cancel-a-reser...
If this is *not* what you are talking about, could you possibly explain what you mean by "deleting" a cancelled booking?