mmm having a conversation also includes questions and answers. The problem is that sometimes people only "wake up" when you ask something in the middle of the conversation and they're "asleep" for the rest of the time. This is kinda annoying. But it's even worse if you can't get an answer as well. It makes you think "What am I trying to do now? Better I shut up".
I think sometimes it's the same when people talk to me. I'm not always so interested in a conversation, so I focus my attention on some specific parts, like when they're asking for a suggestion, or when they're requesting my "active" presence.
And BTW, now I think we're having some kind of conversation, but I don't know if anyone is really "involved"