Hi Roy!
Thanks for visiting the Moms Panel with your question.
It's not a problem at all to make a change to your existing reservation. You won't be able to process it yourself online, but rather will need to call and speak with a Cast Member.
Place your call through the
Walt Disney Travel Company's UK Offices at 0800 16 90 730 and let the Cast Member know that you have an existing reservation that you'd like to make some changes to. Be sure to have your reservation number handy at the time of your call. Advise the Cast Member of your adjusted arrival and departure dates. The reservation will be re-adjusted under the Special Offer you originally purchased, and the upgraded dining plan will be reapplied.
Since the Dining Plan is added per night of stay, you'll have a credit applied equal to 3 less nights of the difference in price on the Dining Plan upgrade. Applicable pricing adjustment to your resort hotel nights and park tickets will also be applied. Before ending your call, the Cast Member will advise you of the new pricing, balance remaining after any deposits you've already applied and your final payment due date.
You'll be all set in a jiffy!
If you have further questions, I welcome you to write me back at any time Roy. I'd love to hear from you again, and it would be my pleasure to assist you.
Wishing you a simply Magical time as you plan your fall visit to Walt Disney World!
Kirsten