You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I'm Raymond Jones. I would like to change my existing reservation.

ASSISTANT: Sure Jones, please wait for a moment. Sorry Jones, I cannot find any reservation under your requirements. Is there anything else I can do for you?

USER: No. Thank you for your information.

ASSISTANT: Thank you again for contacting us.