how to calculate endtransactiontime - starttransactiontime when starttransactiontime is in one event and endtransactiontime is in another event

Hi !! I want to calculate TransactionEndTime-TransactionStartTime, where TransactionStartTime is in CaptureLocation=Request and TransactionEndTime is in CaptureLocation=Response. I tried using transaction but duration is showing 0. Thanks in advance My sample events: Event1 10/17/2017 17:28:50.151 SPLUNK-TRACE - DateandTime=10/17/2017 17:28:50.151;ThreadID=767;ThreadName=WebContainer : 7;meta-transid=12345;TransactionEndTime=10/17/2017 17:28:50.151; Method=GET;URI=/abc/v1/xyz/;Node=Node1;TransactionStatus=SUCCESS;StatusCode=200;CaptureLocation=MicroserviceResponse; Event2 10/17/2017 17:28:50.136 SPLUNK-TRACE - DateandTime=10/17/2017 17:28:50.136;ThreadID=767;ThreadName=WebContainer : 7;meta-transid=12345;TransactionStartTime=10/17/2017 17:28:50.136; Method=GET;URI=/misc/fep/procdiagcodesms;Node=Node1;CacheContentFlag=UNKNOWN;CaptureLocation=MicroserviceRequest;