Set a trap

The more John looked at the Auto Closet the more he saw the possibilities. It was a new model with genetic manipulation and if he could trick someone to get close enough he could change them easily.

The first person to come to mind was his buddy Alex. He definitely didn't have a date yet.

But there was also Mel the ugly nerd that had a crush on him. If he asked her to prom he could toss her in the machine and out pop his dream girl.

Hell as long as they could be tricked/convinced into going to prom he could throw anyone into the machine. Regardless of age or gender.