Since I came to school I've kind of developed a routine. If it's someone I've never met before I start by asking their name. Also ask where they are from. I usually ask what program they are doing and how their classes are going. Then once I know what classes they are taking (they usually name a couple) I ask more about that. Depending on where I am meeting them I ask where they go to school or work and what they do for a job or what they study. Once a conversation is going there are two things that could happen. The first is they only give one word answers and seem completely uninterested. This is when I'm lost. I try to tell myself that it's because they are preoccupied, nervous, or are in a bad mood. I usually end up thinking that I'm just boring and are asking stupid questions. The second thing that could happen is they could actually give you a detailed response. I always make sure to listen closely so I can ask more questions or put in my own two cents on the subject. My biggest problem is talking to these people a second time. I use up all of my good questions the first time so I find it really hard to think of something to say. This has been my biggest challenge. I've found that starting and holding conversations is a skill that needs to be practiced. You quickly learn which questions are good and you get better at judging people's interest levels. It always helps to come off as being extra nice. It seems when I try to play it cool and pretend like I'm relaxed and comfortable, I come off as being boring or even kind of mean. It's good to try and be as friendly as possible. Once a good conversation gets going it really feels nice to be able to act normal and just be yourself. Anyway, I don't know if that helped but it's worked for me.
Reading back on that I guess I didn't really answer your question directly. If I've seen the person around I usually say: "Hey what's up. I think I've seen you around before. What's your name?" or something along those lines. It I'm just meeting them for the first time I say: "How's it going? What's your name?". And if I've talked to them before it's easy to say "Hey. How have you been lately?". Reading those they sound really stupid, but the important thing is to act somewhat relaxed. Not like you are reading off a piece of paper. One more thing, I find conversations get boring if you just drill the person with questions the whole time. It's good to make lengthy comments and have them respond without asking them a question. And try to think of opened-ended questions, not just yes or no ones. Whew, that was a long one. Hope I helped.