How add a request info form to a node

Hi All,
I want to thank u all in advance!

I try explain what I need to do:

I need to add to some node a "request more info" form, at the end of the page.

So, something like the comment, but it will not be pubblic and the form should send a message to the user who created the node with the node title as a object.....

any suggestion???

Cheers!!!