You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My business meeting got preponed. I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, for that I need to know your name.

USER: Katherine Campbell.

ASSISTANT: Unfortunately there is no reservation found with your name.

USER: Not a problem, thank you.

ASSISTANT: Thanks for opting us, have a nice day.