Hi, I need to report a fraudulent charge on my account.
Could you provide a detailed fraud report now, please?
I lost my debit card and before I could cancel it, somebody withdrew $300 at an ATM
Can you tell me your account number, please?
I don't know it off the top of my head. Sorry.
Could I get your full name, please?
Brian White
Right, and your PIN as well please.
I don't have that either.
Could you provide your date of birth, please?
15/09/1940
I am sorry, but I cannot authenticate you with the information you have provided.
Are we at an impasse?
Can you tell me your account number, please?
No, I already told you that I don't know it. 
I guess we are at an impasse then. I need that information.
Are you sure there isn't something else you can do, like look it up using my security questions (just a shot in the dark here).
Thank you and goodbye.