You can cancel a request only if it is submitted for or by you. Otherwise, you must have the Cancel Request privilege to perform this action.
In the Navigation pane, select the Circulation tab.
In the File Activities pane, select Delivery Requests. Requests that are not yet assigned appear in the Pending Requests list.
Select pending request(s).
From the Action menu, select Cancel Request.
NOTE: You can't cancel requests that are assigned and open in the In Process list. You must first un-assign them. Refer to Removing Request Assignments.