You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: Can you help me in change in existing reservation?

ASSISTANT: Sure, may I know your name?

USER: Because, my holiday trip with my friends in my college got postponed.

ASSISTANT: Ok.

USER: My reservation existed with name Rebecca Phillips.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: Ok. Thanks for the information.

ASSISTANT: Thank you for opting us.