I originally booked a U.S. Visa interview appointment for October and had all my documents ready. However, I later found an earlier appointment date and successfully changed my interview date. Unfortunately, I failed to save or print the new confirmation page that shows the updated date and time of my interviews. I know this confirmation is required at the embassy, but now I cannot retrieve, change, or cancel my appointment without it. What steps can I take to recover the confirmation page or resolve this issue before my interview?