Hello,
Thank you for inviting me.
If I got it, you need to check the fluency of the file, which is different from a simple transcription, right? I guess you've got a record from someone sounding not too native. I can't sound anything else than native ;)
If you can tell me more about the content and put it into context I could get the meaning of this document for you and provide you amazing assistance. I think that the next step is to leave me a message, and I'll reply to you ASAP