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The dialogue in a story could be either based on a true-to-life story or just created by the author. While a dialogue in a real-life story could not be based on a fictional story. It is a real-life conversation; unless the speaker is hallucinating or pretending to be in a fictional scenario.
The dialogue in a drama, story can be managed by the author who is its sole creator and s/he can tweak it the way he wants. A dialogue in real life is a two way conversation in which it is two persons who are independent and whose conversation can neither be controlled nor predicted.
it just according to the writers some makes it realistic and others just make their own world :)