InfoPath Dev

Hello,

 I am quite new to Infopath, but I've created a number of succesful form in the past two years.  These have been quite basic, with connections only to WSS 3.0.  I now want to create a form that will populate user information, but research tells me that this isn't easily possible using WSS.  I'm in a large corporation, where I've been told there is an existing webservice that should get me what I need.  

In Infopath I've created a SOAP connection to the webservice (GetUserByLANid).  This gives me query and data fields in my data connection.  On FormLoad I want to populate text fields (LastName, FirstName, etc) from the webservice based on LanID.  I have a field (LanID) already populating using the userName() function.  I just simply don't know how to pass the value in the LanID field to the webservice, to return the results.

 This has to be very simple I'm sure...but you don't know what you don't know:-)  Can anyone suggest a easy to follow sample of how to do this?

 Thank you

 I was hoping someone would point me in the right direction.

As a test, I created a new blank form using the Webservice template so I get the automatic query button.  Just so I understand...if I drag the query field (LanID) on to the form and drag the data fields (LastName, FirstName, etc) into the form and enter a valid LanID then process QUERY I should get a result?

 Nothing happens...

 Here's the webservice test page

SOAP 1.2

The following is a sample SOAP 1.2 request and response. The placeholders shown need to be replaced with actual values.

POST /lookup.asmx HTTP/1.1
Host: practitionerlookup
Content-Type: application/soap+xml; charset=utf-8
Content-Length: length

<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <GetEmployeeByLanId xmlns="http://practitionerpookup/">
      <lanId>string</lanId>
    </GetEmployeeByLanId>
  </soap12:Body>
</soap12:Envelope>

HTTP/1.1 200 OK
Content-Type: application/soap+xml; charset=utf-8
Content-Length: length

<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <GetEmployeeByLanIdResponse xmlns="http://practitionerpookup/">
      <GetEmployeeByLanIdResult>
        <EmployeeId>string</EmployeeId>
        <LastName>string</LastName>
        <FirstName>string</FirstName>
        <Phone>string</Phone>
        <Email>string</Email>
      </GetEmployeeByLanIdResult>
    </GetEmployeeByLanIdResponse>
  </soap12:Body>
</soap12:Envelope>