You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Joseph Young.

ASSISTANT: Sorry to inform you that there is no reservation found under your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.