Try this
<OTA_TourSearchRQ
xmlns="http://www.opentravel.org/OTA/2003/05"
xmlns:xsi="http://www.w3.org/2001/XMLSchema- instance"
xsi:schemaLocation="http://www.opentravel.org/OTA/2003/05/OTA_TourSearchRQ.xsd"
EchoToken="ABC001"
TransactionIdentifier="1"
TimeStamp="2014-07-30T16:57:00"
Version="1.000 "
Target="Test">
<POS>
<Source>
<AgentSine>ABC</AgentSine>
<AgentDutyCode>=DELTAXml</AgentDutyCode>
<RequestorID>
<Type>5</Type> <ID>DELTAXml</ID>
</RequestorID>
</Source>
</POS>
<SearchCriteria>
<DestinationPref>
<RegionCode>5473</RegionCode>
</DestinationPref>
<SearchDateRange>
<Start>2014-08-15</Start>
<End>2014-08-16</End>
</SearchDateRange>
<CustomerCounts>
<Code>10</Code>
<Quantity>10</Quantity>
<Age></Age>
</CustomerCounts>
</SearchCriteria>
</OTA_TourSearchRQ>