Hello Alma, welcome to planDisney!
Without knowing a bit more about what type of reservation you're referring to, I'm happy to provide information for you to help change the reservation date for both theme parks and/or hotels.
If you are looking to change your
Theme Park Reservation date, it cannot be modified, but can be cancelled by visiting
My Theme Park Reservations. If you'd like to cancel your existing reservation and book a new one, please make sure to first check the
Theme Park Reservation Availability Calendar for your desired date and/or park to ensure it's available.
If you are looking to change or update a hotel reservation or vacation package, you can call (714) 520-5060 from 7:00 AM to 8:00 PM Pacific Time daily to speak to a Cast Member. If you're looking to just cancel your reservation, you may
cancel online, and cancellation fees may apply.
Hopefully you are able to make the necessary modifications to your trip Alma, and make sure to visit the
Disneyland website and the
Disney Parks Blog website to see the latest news and exciting happenings at the Disneyland Resort!
Have a magical day!
Melissa