What does it mean when a guy tells a girl this?

Anonymous
There is this guy at my college and he has been saying good afternoon to me when he sees me. For the first time, I was at a table working on lesson and I glimpse someone pass by but I had my back turned. I heard the person say good afternoon but I thought they was talking on a cell. Then the person said it again but a little louder. I was actually caught off guard and it happened so quickly until I just said hey. I happened to see him another day and he said good afternoon and I said hi, then another day he said good afternoon my sister, so I finally said good afternoon back.

I really would like to know what does it mean when a guy tells a girl good afternoon or good afternoon my sister? It could be he's just being nice, he's interested, or maybe its nothing at all. I have been thinking about what he says and its nice but I would like to know what all of it means.
What does it mean when a guy tells a girl this?
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