Dialogue defines your characters. You get to learn a lot about your characters by the way they speak, act and move. If you combine your dialogue with action, it keeps the readers glued to your novel. Observe how people talk and act. Do they move their hands when they speak? Do they raise their eyebrows? Are they stiff or emphatic? Do they speak with an accent? You can keep your characters distinct by their dialogue and it’s important to keep them consistent with their characters.