You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my reservation as my trip to Oakland is postponed. Can you help me?

ASSISTANT: Sure, I am glad to help you. May I know your good name please?

USER: My name is Virginia Harris.

ASSISTANT: Ok, please wait for a few minutes.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.