@Mary-and-Ben0 I can see the pride you have for your lovely home - many, many interesting pictures. Not sure you really want to accept same day reservations (I don't), but if someone is needing to stay at your place the same day, they are probably contacting other resources which may or may not be on Air BNB. Unless a traveler sends a booking request, they are not seriously focussed on your listing. If they are sending inquiries, they are fishing around for the best deal.
I do recall being advised when a guest was pre-approved by me and then booked another Air BNB listing. Haven't had that experience lately, but haven't had the situation come up either.
Good luck with your new business on Air BNB!