Hi sunil,
You just have to pass the header guid( transaction guid ) in IT_HEADER_GUID and APPOINTMENT in IT_REQUESTED_OBJECTS .
In return you will get the table IT_APPOINTMENT where you will get an entry for APPT_TYPE = Z_DT_CREATED and Z_DT_CONFIRM .
Please check using the report CRM_ORDER_READ as I explained in my previous comment as well.
/Hasan