Whether you’re writing a feature-length film or a short film, good dialogue will enhance your characters and bring life to your screenplay. Want to grab the attention of film executives? Write good dialogue!
Characters’ voices must be distinctive and not interchangeable with other characters. Readers must be able to identify who is speaking without needing to look at your character headings. Characters’ speech patterns, idiosyncratic phrases, staccato responses, and even their pauses, will enrich their dialogue and make each character identifiable. Keep in mind less is often more — the less said can prove more poignant.
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http://newenglandfilm.com/magazine/2012/07/screenplay