Hiya Hemal!
Welcome to planDisney! September is a great time to visit Walt Disney World Resort. Crowds are a bit less and
Halloween festivities as well as the
EPCOT International Food & Wine Festival is in full swing. Make sure to enjoy everything!
Oh, the frustration of making plans only to have them not line up properly! I understand your struggles Hemal. However, I'm a bit confused. You should be able to change your
Theme Park Reservation with no problem. I looked at the
Theme Park Reservation Availability calendar and found that the is plenty of availability for September. Just head over to your
My Disney Experience account and select "Modify Reservation" or "Cancel Reservation" on the days you want to edit. If you have a valid Park Ticket that will not expire before the 21st it should be fine.
If you continue to have trouble then please speak to the friendly Cast Members at
"Existing Tickets" to see if they can set up your Theme Park Reservations properly.
I hope this helps and if you have any questions please let us know! We are glad to help!
Happy Planning!
-Nimmy