You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure. Your good name please?

USER: My name is Brian Moore.

ASSISTANT: Please, wait a minute.

USER: Ok.

ASSISTANT: Thanks for your time. I am sorry to inform you that, there is no reservation found on your name.

USER: Thanks.

ASSISTANT: Thank you for reaching us.