Drop down select list by author id
Code to fetch Stores of a user -- Replace node_type with your node type...

global $user;
$result = db_query('SELECT n.nid, n.title, n.created
FROM {node} n WHERE n.uid = :uid and type = :type', array(':uid' =&gt; $user-&gt;uid, ':type' =&gt; 'node_type'));
// Result is returned as a iterable object that returns a stdClass object on each iteration
foreach ($result as $record) {
  // Perform operations on $record-&gt;title, etc. here.
  // in this example the available data would be mapped to object properties:
  // $record-&gt;nid, $record-&gt;title, $record-&gt;created
}



Create a Custom Form -- Form API Reference

Create two fields

Select Field - Options Source - Run a query against node table to get list of node id's given user id filtered by type and status of node
Offer Request - Text Area

On Submit handler
Read Select Field Values , Offer Request Text
Send Email to admin using hook_mail