WCF serialization & namespace

[ServiceContract]
    public interface IEventDismiss
    {
        [OperationContract]
        [return:MessageParameter(Name="response")]
        [XmlSerializerFormat]
        Response EventDismissRequest(Request request);
    }

[DataContract(Namespace = "")]
[Serializable]
public sealed class Request
{
    [DataMember]
    public string EventID { get; set; }
}

Above is my definition of the WCF service I'm trying to run, with the above I would get the following request structure in my SOAPUI

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://tempuri.org/">
<soapenv:Header/>
<soapenv:Body>
  <tem:EventDismissRequest>
     <!--Optional:-->
     <tem:request>
        <!--Optional:-->
        <tem:EventID>?</tem:EventID>
     </tem:request>
  </tem:EventDismissRequest>
 </soapenv:Body>
</soapenv:Envelope>

Is there a way I can get rid of the namespace tem under request and EventID but leave it on EventDismissRequest? so that my reqeuest data structure would look something like below:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://tempuri.org/">
<soapenv:Header/>
<soapenv:Body>
  <tem:EventDismissRequest>
     <request>
        <EventID>?</EventID>
     </request>
  </tem:EventDismissRequest>
 </soapenv:Body>
</soapenv:Envelope>