V-Flyer

I'm booked on the VS008 tonight form LAX but need to change to tomorrow or Saturday. I'm on an upgrade to Premium but no seats available in either Premium or Upper. Any ideas what I can do? It;s pretty urgent - they said I would lose my upgrade miles if I switch to Economy. Silly question but is it worth the risk and hope I can get an upgrade tomorrow?

Stupid question, just hoping for some help. I need to stay to be with a friend that's very ill.

Thanks

Tomorrow has seat availability in J and W, Sat less so. Revenue might smile on you but it's an inexact science.