You felt what, indifference? All that would mean is that your subconscious believed everything was right in the dream for that person to be there in the dream at that moment.
Some also believe in dream messages that possibly the person is broughtto mind for some reason, or perhaps sone aspect of your unconscious self was being expressed as that person.
Your brain is not able to fabricate faces, but assembles them from knkwn faces. It is possible that your friend us an expression of part of yourself or even, depending on your own beliefs, a separate entity.