In Venues, click the Reservations tab.
Click the edit icon on the reservation you are cancelling.
Click on the Facility Reservations section to expand the options.
Under the Facility Reservations tab, scroll towards the bottom of the page and find the specific reservation you wish to Cancel.
Under the Status section, you will click Cancel.
When finished scroll to the very bottom of the page click the Save Application button.
When going back to your Facility Calendar, you'll see that the Reservation you changed the Status of to Cancelled does not show up.