Was associated with booking.com through trivago.co.uk when arranging a resort in birmingham. Web sites car-stuffed the times (why?! That you don't understand after Iam going why recommend times!) and therefore I created an error and reserved to get a evening almost four weeks later than needed. I acknowledge, it was my error along with a really foolish one at that. Nevertheless, on attempting to cancel the booking, booking.com stated their plan of getting to pay for additional for that booking in order to stop, and explained the resort were reluctant to cancel the booking. I greatly doubt that booking.com actually approached the resort to stop the scheduling, since they'll be obtaining a proportion of the booking charge
A good website to determine which resorts have openings, but I would recommend calling resorts straight before turning to scheduling through this website as customer support is very bad.