Need help!

Alright so I'm trying to figure out a classic video game "life" mechanic, where you start with X lives and when you have none left, you lose and the game resets. I figured the timer would be easiest to set your lives. What I can't figure out is how to rig the reset on the game manager to a activate when you have 0 points. I would also like to incorporate a prompt before the game resets. Any help is appreciated! Thanks!