Women's Fiction: The Freedom and Fun of Writing Dialogue
An argument! It's perfect for a dialogue! What they're arguing about depends on whose point of view you're in. Try the woman's point of view first. Then turn it around and write the same scene from the man's point of view. You might have a totally different story! You'll not find any other situation where point of view alters the story so much, and therefore the dialogue is fun and easy to write. They can argue about anything.
A few things to remember: Stay in point of view. When you're writing from the woman's point of view, it's her story and you need to give her free rein. Get into her emotions, her head, heart, and gut, don't get inside the man's head, heart, and gut.
You see him and everything in the scene through her eyes only. He speaks and acts, but that's it. Then switch points of view and she can only speak and act. This is a great exercise for both dialogue and point of view.
If you think you can't write dialogue, don't worry. I've never worked with anyone who can't write dialogue, only with people who think they can't. It's amazing what you will learn about your story, once you free the characters to say everything they want to say!