Edit a short book (5700 words) written in a screen play format

I have written a short book (5700 words) that is 95% dialogue. It is a business book explaining branding as a concept for freelancers and independents, and is basically a conversation between two people. I also have a very short "prologue" introduction (again in a dialogue format). What I would like you to do is proof read and edit the dialogue as it is written (in a light, fun, a bit sarcastic tone) and fix any context flow issues (if there are any). As a freelancer, this book is geared towards you as a demographic, so you should be able to read this book and it should make absolute sense to you. I think the job should take no longer than 4 hours.