Relax, I'm from the Future

Casper, a charming but underprepared Time Traveller, is trapped in the past. He befriends Holly, a jaded drifter, who helps him exploit his trivial knowledge of the future for a series of quick payouts. When a more competent Time Traveller tracks them down, Casper and Holly are forced to figure out what they mean to each other and whether the future they've threatened is even worth saving.