You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me to change my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I am Amanda Baker.

ASSISTANT: Wait a moment please?

USER: Sure.

ASSISTANT: Amanda Baker, we regret to inform you that there is no reservation found on your name in our records.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.