do we know but not know we know

Long story short, I want to access lucid dreaming so I can talk to some people I know and ask them some questions. I've talked to people in my dreams before but not by choice and the things they say always seem so suiting and true, something that person really would say and usually that turns out to be what they think although I didn't think I had the foggiest. Does that mean I subconsciously know about a person's reaction to something and my dreams let me know what that is?

Well, your subconscious is putting together the things you know about that person and creating a probable response. Nobody can really know before hand what they will say, but it will probably be something similar. Hope this helps.

That doesnt really work :( I've tried the exact think you are talking about and the person replied with a (believable) nonsense...