Examples of dialogue conversations are found in novels, theatrical plays and films. Depending on the conversational style desired, these art forms feature natural dialogue that best mimics conversations in real life.
Defined as a conversation between two people, dialogue is a key component in books, plays and films, which is why they're the best place to find examples of realistic discourse between two people. Finding examples of dialogue in literature can be a widespread search through centuries of work. William Shakespeare and Oscar Wilde are considered masters of classic dialogue, in spite of being antiquated by present standards. Modern masters of writing dialogue include, but are not limited to: John Steinbeck, Ernest Hemingway, Jeffrey Eugenides, Judy Blume, David Foster Wallace, Toni Morrison and Elmore Leonard. Recommended works of Jeffrey Eugenides include "The Virgin Suicides" and "Middlesex".
If searching through literature for examples of dialogue isn't appealing, movies provide an excellent source of dialogue in video form. Movies by Quentin Tarantino, Woody Allen and the Before Sunset series are recommended examples of exceptional dialogue between characters. Once a desired scene is found in the chosen film, the screenplay for a written record of the conversations may be used as a reference.