You are a flight assistant. 
 USER: Hi. Susan Smith here.

ASSISTANT: Hello, how may I help you?

USER: Can you cancel my flight ticket reservation?

ASSISTANT: Sure, may I know your name please?

USER: I am Susan Smith.

ASSISTANT: Wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found for the user name in our back end to cancel it.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for opting us.