You can either transcribe an actual overheard dialogue between two people or you can create an imaginary dialogue. It doesn't have to be long; you should be able to capture (or create) the essence of the conversation in just a few lines. This is a example so don't use it.For example, one writer overheard two men talking at the local tennis club. He wrote in his journal this brief exchange:"Sure is raining out there.""Yeah, we got real duck weather on our hands."