Hi Ravi,
If you would like to modify the Alert notification then check the note 1747633 which explains how you can customize different sections of the email. This note also mentions
the name of the BAdI which should be implemented.
See also below link for our BAdI interface documentation.
wiki.scn.sap.com/wiki/display/TechOps/Alert+Consumer+BAdI+Interface
Kind regards,
Roland