Dialogue is an essential part of any creative writing, such as novels, movies or plays. Dialogue can be used to tell the story, give character development, and create mood.
The reader likes to sympathize with the character he wants to be on the character side to feel sorry for the character. In short, to become emotionally involved basically the reader needs to care for the character.
In creative fiction, dialogue can take many forms. One of the most common types is narrative speech that comes from a person in order to explain their thoughts or feelings about something.