You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, can I have your name please?

USER: Sure, my name is Margaret Walker.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for opting us.