Hello, I'm planning to apply for 30 days extension on my travel visa. I noticed that on the tm7 form, there is a field for TM 6 form No. but I never had to fill this in at the airport and I was let through without any questions. How can I solve this issue? also please let me know if there are any tips or guides online to help smooth out my extension process. I'm mainly doing it to switch over to non-ed visa with my university as they said I needed 1 more month of time for it.