“Dialogue in most videos is the chief means of conveying what the event is all about (theme), developing the story progression (plot), saying something specific about the people in the story (characterization), and describing where, when, and under what circumstances the event takes place (environment and context). […] The opening dialogue in serial dramas usually recounts what happened previously, tells where the story is now, and suggests where it may be going. […] All this information is contained in a few lines of carefully crafted dialogue.
Good dialogue seems to flow naturally. As most writers will confirm (…) good dialogue is meticulously constructed to sound and feel natural yet communicate a maximum of information. It should make you wish and said it that way.”
Herbert Zettl (2008), Sight Sound Motion – Applied Media Aesthetics, 5h edition.