Hello. My name is  Jane Doe 
Hello, how can I help?
I want to check my bank balance. My account number is  95381901 and the PIN is 0314.
What was your mother's maiden name?
Why do I need that? I have given all that is needed to verify my account.
It is for security reasons before I can access your account. 
Try with what I provided please
Ok. Looks like the system has given me access. Your current balance is 4447 in credit.
Thanks . Have a great day.
Is there anything else that I can do for you?