@Pam1457
If you cancel, you will face penalties and the dates will be blocked. So it is not a solution.
I assume the second quest sent an inquiry (not a booking request), as the second part of the renting periods he wishes is not available on the calender. Maybe he likes to book oktober-mid november ?
These things happen.
If you only want to rent whole period, then you must increase the "minimum stay".
Maybe also do not use " Instant Book" for long term stays, then you have manual control (and 24 hours for some communication/checking) before accepting a booking.
best regards,
Emiel