@David3739
It's always a good idea to connect with other hosts in your street so you can help each other to relocate guests in case of the emergency or overbooking.
At your place, I would ask my neighbors hosts if they have a free room to take my guest for 1 night if so I would contact my guest, explain the situation and hope he would accept my offer.
If not, I would ask my long term guest if he would like to relocate for 1 night to my neighbor and then came back the next day ( chocolade cake/bottle of wine, refund for 1 night ..you know 🙂