Hello Balaji,

Thank you kindly for your feedback.

For email sends, you would be interested in the JobID and SubscriberID (or SubscriberKey) combination that can be accessed in the _Sent dataview.

For an individual SMS there is the the MobileMessageTrackingID in the _SMSMessageTracking dataview.

This diagram courtesy of Zuzanna Jarczynska will prove useful to you: https://svgshare.com/i/Edm.svg