You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Due to an Auto-show event in my area, I want to change my existing reservation.

ASSISTANT: Sure, May I know your name?

USER: I am John Young.

ASSISTANT: Ok, Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patient, There is no reservation found on your specified name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for choosing us.