What does it mean when you dream of talking to a dead person you never meet?

It means like, say, you admire Abraham Lincoln for his bravery. But he's dead. But you still dream to talk to him, because you admire him.

The meaning of the dream depends on the identity of the dead person. Dreaming of a celebrity or historical figure - such as Lincoln - would be very different from dreaming of an anonymous person such as a stranger or a war victim, etc. There are far too many possibilities to attempt a specific interpretation. Please see the attached link for further discussion.