You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Jack Johnson.

ASSISTANT: Ok.

USER: Owing to an emergency, I want to cancel my recent reservation, can you help me?

ASSISTANT: Sure, please wait for a few minutes.

USER: Sure.

ASSISTANT: Thank you for your patience, we did not find any reservation on your specified name.

USER: Ok, thank you for informing.

ASSISTANT: Thank you for opting us.