Please add "incorrect number of guests" to the list of reasons a booking may be declined.
I often need to decline a request to book because the number of guests is incorrect. I have to decline and tell the guest to resubmit their request. When I decline there is not a good reason to select...."not available", "not suitable", "waiting for a better booking" (this is good when the requestor is asking for a discount), etc. Alternatively, if I can change the guest count and "accept" the request, the guest could then "confirm" the change to finalize the booking.