Hi @Eva3471
I agree with @Mike-And-Jane0 . Another caution about altering dates on a reservation to future dates. There is a known loophole scam If a guest knows they won't get a refund due to your cancellation policy. They will ask to alter dates into the future that would allow a full refund. Then after the Host accepts the alteration, they simply cancel the reservation within 48hrs and get a full refund.
Guests know your cancellation policy when booking. If they are concerned they might need to cancel and won't get a refund, they should purchase travel insurance when booking (Airbnb offers it on the booking page). This is especially true for large properties where the booking amount is substantial: