I'm going BKK-HAN on April 30. Problem is my tour company told me we'd be entering VietNam on May 1. So my visa says May 1st entry.

Will this be a problem or are they flexible? I'm still in Washington until 4/27, so it may be possilbe to tussle with the consulate if necessary, but not something I look forward to.

Anybody dealt with this sort of thing before or have an good guesses about attitudes at the HAN entry point?