How to cancel a booking?

Dear Sirs,

I have got a new booking on 05/07/2018 with 

Booking confirmation — xxx

They are 6 people. I do not have a place for six people. I have only two rooms and it is full for 13/07/2018 so please help me to cancel this booking.

Chin Thapa

Ganesh Home Stay

Angela @Promhills

You need to contact booking.com via your extranet or telephone. This forum is other property owners who can not help you to cancel a reservation - booking.com customer service will need to do this