You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I support you?

USER: My college fest has been postponed. I want to change my existing reservation to Oakland.

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

USER: I am Nicole Martin.

ASSISTANT: Ok, Please give me some time.

USER: Sure.

ASSISTANT: Thank you for your patience. There is no existing reservation found on your name.

USER: No problem. Thanks for your kind information.

ASSISTANT: Thank you for opting us, Have a nice day.