You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you? May I know your  good name please?

USER: Due to an emergency, I want to cancel my recent reservation. My name is Jack Davis.

ASSISTANT: Sure. please wait for a while, I will check and revert you.

USER: Ok.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us. Have a great day.