You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: Sure, may I know your name please?

USER: I am Elizabeth Young.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: Thanks.

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