You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Gregory Lee. I would like to cancel my booking but while cancelling, I need to enter OTP but the mobile which I mentioned while booking was expired two months back. What to do now? Could you please assist me?

ASSISTANT: Sure Lee, I am happy to help you with that.

USER: Ok, sure.

ASSISTANT: Please wait a moment to check your reservation status. Sorry to inform you that no reservation has found under your name to cancel.

USER: Ok fine. Thank you.

ASSISTANT: Welcome. Thank you for choosing us, have a good day.