You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Can you please help me to cancel my reservation?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: My name is David Lee.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for time, sorry no reservation found on your name.

USER: Ok, not a problem. Thank you for informing me.

ASSISTANT: Thank you for reaching us, have a nice day.