Property Transfer to response Mock http header

Here is the senario;

The Mock response:
Response xml:

   

   
     
   


and for extension,soap http header "sessionid " is added.  I want to get the session id from a property file or from the request's soap header ;

Request

   

<sessionid xmlns="">?sessionid>

   
     
         nan

     
   



Please help me! I need an urgent solution for my project.

Thank you