Say yes, you will be his ally

From Create Your Own Story

"Of course I will, Mickey!" you exclaim. That's exactly what you've been waiting for, and you're glad it happened. If you're lucky, the two of you together will be good enough that one of you makes it back to District 5. That was the goal, right?

He looks you in the eyes, and whispers something, "The plan is, when it starts, run as far away as you can. Then we'll find eachother."

Since you already have an alliance, the only choice is to Begin the Games.