Then switch chairs and talk back to yourself. Keep switching back and forth. Let the conversation progress. If you are in an adventurous move, get together some friends and reenact the dream as if it is a play. Assign roles to people.
People can also be objects in the dream.
First replay the dream as it actually occurred. Then do it again and let people improvise in their roles. This is a powerful technique. Let your imagination go. Don't try to force or over-control the process.