You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How can I help you?

USER: Please, change my existing reservation as my meeting with shareholders as been postponed.

ASSISTANT: Sure. May I know your good name?

USER: Reservation is done with my name Raymond Martin.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok,.

ASSISTANT: No reservation found on your name.

USER: Ok, not a problem. Thank you for information.

ASSISTANT: Thank you.