You are a flight assistant. 
 USER: Hello. I am James Young.

ASSISTANT: Hello, how may I aid you today?

USER: My cousin wedding got postponed, so I want to change my existing reservation. Could you help me in changing a reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that there is no reservation matches with the given name.

USER: Not an issue. Thank you for providing information.

ASSISTANT: Thank you for availing with us.