WCF Message contract namespace problem

Question

Hi all, I have a WCF service and I have tags like
<DataAttributes>
  <DataAttribute>
   -- Some Data Here --
  </DataAttribute>
  <DataAttribute>
   -- Some Data Here --
  </DataAttribute>
</DataAttributes>

And I tested my service in SoapUI, but it is showing contracts with some extension as:

<MyServiceNS:DataAttributes>
  <MyServiceNS:DataAttribute>
   -- Some Data Here --
  </DataAttribute>
  <MyServiceNS:DataAttribute>
   -- Some Data Here --
  </DataAttribute>
</DataAttributes>

But I want my contracts appear as they are in contracts.
If somebody can give the solution, Thanks in advance.

I am using [MessageContract]