Being allowed to get off is usually up to the ops agent working the flight that would be boarding. If you arrive early on your 1st leg of your flight your chance of getting off is higher if your late your probably going to be told no because as soon as the last person is off the plane boarding begins and sometimes a plane will turn in 25min. You can always explain your situation to the FA when the 1st flight arrives and they can ask the ops agent
If you get off bring your ID with you as that will be required to get back on the plane
