To decline a booking request:
I log onto my account
I go to my Dashboard, my bookings will appear and I click on "View".
Then I click on "Answer now".
A page will appear detailing the request (number of people - message from the guest...), I go down to the bottom of the page and I click on "Decline":
The window below will appear. I leave a message to my guests explaining why I have to decline ;-) then I click on "Decline".