Send Enquiry feature Customization

Dear Sirs
This is a feature I am interested in. If someone can develop it at a modest cost, please let me know.

I need a sort of email/communication management system.
Send Enquiry
Communication will be one to one and threaded:
Listing Owners receive an email from the website
With some User request data
Name (No telephone and/or email)
Event date,
kind of event and # of seats,
message
+ a button to answer trough the website (listing owners will be redirected to the Directory website, log into, and redirected to the request section and specific message.
Then he can answer by writing a message in a box
And uploading a file (menu etc.).

– Message should have status like
read,
unread,
waiting (read but for a reply),
rejected,
archived

Any help/suggestions will be REALLY appreciated
Regards