Cancellation and rescheduling policies depend on how your reservation was made.
If you booked directly through CourtsApp, you can manage your reservation in your CourtsApp account, subject to the facility’s cancellation policy. Didn’t create an account when you booked? No problem. Create one using the same email address you used for your booking and your reservation will be there.
If you booked through a facility’s website, you’ll need to manage your reservation directly with that facility.