You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Jeffrey Wright and I would like change my reservation as my plan for receiving my brother got postponed.

ASSISTANT: Wait a minute.

USER: OK.

ASSISTANT: Sorry to tell that there is no reservation on your name.

USER: OK, thank you.

ASSISTANT: Do you need any other help?

USER: No.

ASSISTANT: Thank you for contacting us.

USER: OK, thank you.