If you are trying to get a lunch Fantasmic package for your trip next month it might be because you are close to your trip and they are all booked. You'll have to keep checking online to see if anyone cancels. Be sure you are checking for the package and not just a regular dining reservation. You could also try checking for MM to expand your options. Also, there's a cancellation thread for October on the Dining Reservations board that you could subscribe to.