In university - How do I approach this guy I find cute but don't even know?

We live in the same residence of 800 first year students.

The first time I saw him, we were both locked out of our rooms and were asking the front desk to help us out. Ever since then, I've noticed him in the cafeteria. It is hard to approach him because he's always with friends.

I only think he's good looking, I don't know anything else about him. There are too many people in the res for us to meet at some res event or party. The next time I see him when he's alone, I want to say something to get his attention or name at least. What can I say that won't creep this guy out?
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*I'm most likely going to talk to him if I'm ever alone in the elevator with him or if he's sitting alone in the cafeteria. What can I say to him in these situations? I'm a pretty confident girl but I think he's shy so I don't want to make him creeped out
In university - How do I approach this guy I find cute but don't even know?
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