You can't cancel a reservation, only the guest can. Contact them and explain why and ask them to cancel. Worth doing some research beforehand so you can tell them about some alternatives nearby for similar price. If you ask booking.com to do it for you they will charge you for relocation.
not valid credit card ? in this case you can mark the credit card not valid trough the extranet and in case of no reply from the guest you can cancell the reservation your own .
overbooking? in this case please contact Booking.com and they will help you in this .
You can't cancel a reservation, only the guest can. Contact them and explain why and ask them to cancel. Worth doing some research beforehand so you can tell them about some alternatives nearby for similar price. If you ask booking.com to do it for you they will charge you for relocation.
Hello Lisa Maini! Welcome to the Partner Community, and thanks for asking your question. Please, have a look at this article about cancellations: https://partner.booking.com/en-gb/help/legal-security/important-information-regarding-coronavirus#DATECHANGESCANCELLATIONS
Dear Peace & Plenty
why you need to cancel a guest booking?
not valid credit card ? in this case you can mark the credit card not valid trough the extranet and in case of no reply from the guest you can cancell the reservation your own .
overbooking? in this case please contact Booking.com and they will help you in this .
take care
Luigi