Hi there, Amy! Thanks for stopping by planDisney with your question!
It sounds like you will be at the Disneyland Resort in just a matter of days! How exciting!
The only way to change a theme park reservation is to cancel your current reservations and make new ones. Since the time around Thanksgiving is a very popular time to visit the parks, I just took a look at the
theme park reservation availability calendar and it shows that, unfortunately, November 24th is currently unavailable. So, if it is at all possible to keep your reservations to enjoy the parks on Monday, November 22, I suggest you keep your plans as they are.
If visiting on Monday simply isn't possible, it looks like the next date with
reservations available would be November 29. It is possible that more availability will open up in the next few days, so you can certainly keep checking. But you will want to be certain there is availability before you cancel any existing reservations and try to make new ones.
I hope this helps! Have a magical day!
-Linda