I am on H4 and have expired visa stamp. I plan to travel to India. My husband is in middle of switching jobs and will invoice H1B transfer. On CGI visa application site we need to provide petitioner information (name/petition number). My question is - if i secure appointment based on old I-797 information and then we receive new I-797 prior to the stamping date, then is there a way to change the I-797 information without cancelling the appointment?