Hi @Nisha B 

Create Email Script for the notification and in that email script write code like below and try.

var requestedFor=current.u_requested_for; 
var grUser=new GlideRecord('sys_user');
grUser.addQuery('name',requestedFor);//if sysid is in Requestedfor field then use grUser.addQuery('sys_id',requestedFor);
grUser.query();
if(grUser.next())
{
email.addAddress("cc",grUser.email,grUser.name);
}

Please refer the below link.

https://www.servicenow.com/community/now-platform-forum/how-to-set-cc-with-email-content/m-p/1025103 

Please mark my answer as helpful and correct if it helps you.

Regards,

Namrata