I've been playing this game since release and so far ran probably over 1000 runs in df. Long ago I used to say hello, bye and other things to keep up a conversation. But you know, after 1000 runs I just don't bother anymore. I don't even look at their names. To me they are just NPCs, not real players. There is no real interaction or teamwork required in dungeons. The tanks pull mobs, healers heal, dps burn stuff. Everyone knows the dungeon and how to do their job. It's just the way the game is designed.