To dream you are on a talk show or that you are friends with a talk show host can mean that your subconscious mind considers that person a friend because you “interact” with them often, or like to “interact” with them by watching their show. (The subconscious mind doesn’t see much difference between a person talking to you from the TV and a person talking to you in person.)
Late Show with David Letterman dream meaning
Read more about dreaming of Late Show with David Letterman in other dream meanings interpretations.