How to writie a dialoge for a story

Ferran: Eli, Eli! Can you hear me? I need a lot of help!
Eli: Ferran? Where are you? What's happened?
Ferran:I'm down, left here. I was climbing this mountain and I fell. I fell about twenty meters. I'm getting up now.
Eli: Are you right? Can you climb up here?
Ferran: No, I think I've broken my left arm, right leg, my ankle and I injured my knee. I can't move it.
Eli: Ahhhh... Don't panic. Let's phone the rangers
Ferran: Ok. But hurry up. I don't know haw hong I can stay here. Hurry up.
Eli: Ok, Ok, hang on
Ferran: Eli, Eli, El-i, E...
Eli: Noooooooooooooooooo. ferran!!!, Ferran!!!