message lookupUserResponse
parts 
response
element resolver:lookupUserResponse
used by 
Operation lookupUser in PortType EntityResolverService
source  
<wsdl:message name="lookupUserResponse">
  <wsdl:part name="response" element="resolver:lookupUserResponse"/>
</wsdl:message>

WSDL documentation generated by XMLSpy WSDL Editor http://www.altova.com/xmlspy