How Do I Send RS Parameter To XML Query?

I Have this web service method:

[WebMethod]

public DataSet EeoReport(DateTime start, DateTime end)

{}

I have this XML query that sends blanks to start and end and properly gets my data.

<Query>
<ElementPath IgnoreNamespaces="True">
EeoReportResponse {}/
EeoReportResult/diffgram{}/
DataSetName {}/TableName {Field1, Field2, Field3, Field4, Field5, Field6, Field7, Field8}
</ElementPath>

<SoapAction>http://services.mydomain.com/EeoReport</SoapAction>
<Method Namespace="http://services.mydomain.com"
Name="EeoReport">
</Method>
</Query>

How do i add RS parameters to this query to represent start and end in the above webmethod...?