I think one of the big reasons why I'm no good at conversations is that I don't really want to talk to people... When I say "how are you?" I'm just fishing for something polite to say, I usually don't really care for the answer if they are already looking perfectly healthy. Beyond that... I don't really like trying to force being genuinely interested... I could do "you look nice today" or something dumb, but if I don't think they look particularly nice, I'm not about to say they do.