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Dialogues are not structured with dashes in American English or even in British English novels, no.

In an English novel, we' have just have (with each line being a new paragraph, with each speaker's part inside its own quotation marks).

"Hello!"
"Hi."

Ok so I learnt something too^^

But I ...

Could you be a little clearer about what you want help with? I don't understand how writing dialogue in a novella is any different than writing normal paragraphs.
I mean, in latex when you hit Return once, it isn't considered :
LaTeX :
"Hello !
-Hi !"
PDF after compilation :
"Hello ! -Hi ...

Hello,

I'm writing a Novella and I'm trying to use LaTeX, despite the difficulties it brings.
I would like to know how to write dialogs like :
"Hello !
- Hello, how are you ?
- I'm fine, thank you."

And it would be really great if you could show me where I can find examples of books written with ...