Greetings and salutations!

I'm sure most of you have heard and answered this question at-least zillions of times but I would ask just to refresh your memories. I have been trying to write a film script based on a true politically motivated story. I have the story, alas! in mind and no matter how much I try, I'm always coming with boring, sluggish dialogues. I'm not sure if it is because I already know the story or what but it is annoying. Therefore, I would like to hear your suggestions/opinions for improvement. Above all if you know any short book/novel/script that might enlighten my thoughts would be greatly appreciated.

Best Regards,
John Alia