You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, may I know your name please?

USER: I am Justin Smith.

ASSISTANT: Wait for a while.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.