Yes, you can cancel/reschedule your Exam Date. But, keep in mind, you have a 90 day window with the USPTO to take the exam (from the date you were accepted to sit for the exam). Thus: If taking the exam at a later date puts you PAST 90 days from when you were accepted, you might want to reconsider (as you’ll have to re-submit an application to the USPTO). To cancel/reschedule: From the Prometric.com home page, click on the button for canceling/rescheduling. You’ll need your conformation number as well.
Updated on August 16, 2016