Whether it's the teenager trying to convince her father to give her the car, the woman pursuing a man for marriage, a salesmen trying to close a deal, or a guy at the bar trying to get a girl to go home with him.
Every scene is a slice of life.
In order to make it interesting, the playwright squeezes all the extraneous material out of the play and leaves only the critical dialogue. The residual is what makes the play dramatic. The playwright chooses the one or two conflicts that he desires to communicate to his audience. If he didn't edit down to the minimum, a play would become a soap opera, and unwatchable. Therefore, each play has an overriding conflict, and internally, each scene is a battle in the struggle.