You are a flight assistant. 
 USER: Hello, I am Christine Baker.

ASSISTANT: Hello, how may I assist you today?

USER: Owing to an emergency I want to change my existing reservation.

ASSISTANT: Sure, Please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, We found no reservation with your name to change it.

USER: Thank you for providing information.

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