You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Owing to an emergency, I just want to cancel my recent reservation.

ASSISTANT: Please wait a while.

USER: Sure, my name is Jonathan Lee.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Ok, thank you.

ASSISTANT: Thank you for opting us.