All the operators we work with use unique and individual bookings systems. Therefore it's very difficult to ascertain in the moment if places are available. In many cases places will be available when you make the booking but prior to issuing your ticket(s) we will always contact the operator and confirm availability.
If a particular trip is unavailable then we will always attempt to find a suitable alternative and where one is not available we will issue a full refund as per our refunds policy.