Linguistics 101 with Mike Dellosso
And you, you there, what are you hiding behind your back? Flarp? Really? My third grader plays with that stuff. Put it away, please.
Language, both verbal and non-verbal, is a very important element of writing fiction. Your readers don’t want pasty dialogue that sounds like you scooped it out of some can, they don’t want flat characters acting out their roles like preprogrammed robots, they want realism. They want to be able to feel as though the characters of your story are real and living people inhabiting a real and living world.
Then go home and take notes, jot down what you saw and heard. Copy conversations so you get the feel and rhythm of dialogue between two or more people.