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?

USER: I am Jack Moore.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting, There is no reservation found on your name.

USER: Thanks.

ASSISTANT: Thank you.