You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Anthony Davis.

ASSISTANT: Anthony, nice to meet you.

USER: Can you help me to change my reservation? Because of some work.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Anthony, there is no reservation found on your name to change your reservation.

USER: That's fine. Thank you.

ASSISTANT: You are welcome.