For further modification, such as changes in date, time, or party, you can either cancel and rebook the reservation by calling 1-800-950-4401 or visit Guest Services once onboard. For beverage and internet packages, no modifications can be made in the app, but you can cancel and book a different package by contacting 1-800-950-4401.

https://www.devex.com/people/can-you-cancel-and-rebook-royal-caribbean-2096670