You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I render you?

USER: Please cancel my recent reservation owing to an emergency.

ASSISTANT: Ok. May I know your good name for further process?

USER: I am Charles Wilson.

ASSISTANT: Please, hold on. I will be back and revert you.

USER: Sure.

ASSISTANT: No reservation found on your name.

USER: Thank you.

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