You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: There is art museum in Chicago but due to some reason I can not go can you change the reservation to other day?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: May I know your name?

USER: Sure, my name is Laura Johnson.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: We could not find any reservation on your name in our database.

USER: No problem, thanks for your help.

ASSISTANT: Thank you.