Nervousness

So I'm into this guy that works at the local Starbucks where I happen to go to school. He always talks to me and lately he pays more attention to me. He's learned what I like to drink when I come and he noticed my hair had changed. It was funny because it seemed like he got shy when I had my hair in braids instead of my usual ponytail and it was awkward talking. I really want to give him my number but I just don't know how to approach him. HELP!!!