with a guy who works at taco bell?

I know that seems stupid lol but i was there a few days ago and this guy gave me a free cookie sandwich and cinnamon twists, it seemed like he was kinda interested, i dont know what to do? Like how to talk to him? Should, when i hand him the money, give him a piece of paper with my number? Or would that seem desperate? I was there with my little niece, and she talked about him all day, should i mention that? Would he remember me? Help me pleasse and should i wear the same thing as i did the last time so hed remember or just something similar? Im going wednesday