You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Stephanie Carter. I want to change my existing reservation as my family meeting got postponed.

ASSISTANT: Sure, please stand by I will check the status and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that there was no flight found with your name.

USER: OK, Thanks for your information.

ASSISTANT: Have a nice day.