Bangalore Namma Metro - ಸ್ವಲ್ಪ ಜಾಗ ಕೊಡಿ

His name would be in the chart. The passenger should immediately approach the TTE or Train Supervisor (normally sits in AC coach) or guard and report loss immediately, mentioning, and showing ID proof. TTE will check chart/guard will issue certificate/note and inform the TTE. Depending upon the circumstances, the TTE may charge clerkage, I think Rs 50.
In case of E-ticket, an sms on your mobile helps to show TTE that ticket is yours...
If you are an agent, always load the mobile number of your client, so that the client receives...
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it. Anyway, as agent, always keep a copy of the ticket with you offline, so that client can retrieve the information such as ID transaction No, PNR number, and client can use mobile to call you and you can speak with the TTE. The charge of Rs 50 will apply.
IF for some reason, you have loaded your mobile number while booking, just forward the sms received to the client and ask him to keep it safely, without deleting it till journey performed.
Good wishes.