You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you today?

USER: My name is Patrick Green.

ASSISTANT: Ok.

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

ASSISTANT: Sure. Please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for being patient. Unfortunately, there is no reservation found on your given name.

USER: No problem, thanks for your help.

ASSISTANT: Thank you for choosing us.