You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: I'm Betty King.

ASSISTANT: Yes Betty, how may I assist you?

USER: Actually, destination of my trip got changed.Could you please change my existing reservation?

ASSISTANT: Sure Betty, please wait for a moment.

USER: OK.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: OK, fine.

ASSISTANT: Do you want any more information please?

USER: No, thank you for your information.

ASSISTANT: Thank you and have a nice day.

USER: Welcome.