You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Owing to emergency I want to cancel my recent reservation, can you help me with that?

ASSISTANT: Sure, may I know your name please?

USER: My name is Stephen Allen.

ASSISTANT: Please wait while I find your existing reservation in our system.

USER: Sure, take your time.

ASSISTANT: We don't have any reservation your name to cancel.

USER: No problem, thank you for the checking.

ASSISTANT: Thank you.