The custamer don't communicate

The custamer has booked our accommodation in January...the reservation is for Christmas...but the custamer don't communicate. We have sent mail no answer. The phone number don't work...how can I cancel the booking.

Thank you for your answer 




If guest booked in jan 2020 for dec 2020,

Then since you tried to message them but no response, 


Then either you wait for them to arrive,

Or no-show


Assuming they prepaid, you still get paid



So why are you trying to cancel?