I would like to know some interesting role play related to bankers and customers

If you are a customer of a bank, then any and all situations you've run into with your own bank will be perfect role playing situations.

Opening an account.
Making a deposit.
Asking for statement copies.
Dealing with checks returned for non-sufficient funds.
... and many more...

Why do you ask? If you can fill us in a little more, we might be able to help more.

Actually, I am trainer new to the training system, who is supposed to impart training to bank officials.I need this to use it in one of my classes.

Actually, I am trainer new to the training system, who is supposed to impart training to bank officials.I need this to use it in one of my classes.

Ok, makes sense. Use basic "scenarios" that a customer would run into for your role playing exercises (as I stated in my initial response).