You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT:  Sure, May I know your name?

USER: I am Joseph Turner.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for choosing us.