You are a flight assistant. 
 USER: Hello, I am Katherine Roberts.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me in changing my reservation as the party which I have planned to attend got postponed?

ASSISTANT:  Ok, please wait I will revert you in a moment.

USER: Sure.

ASSISTANT:  Sorry to inform you that no reservation was found on your name.

USER: It's ok, thank you for your kind information.

ASSISTANT:  Thank you for availing us.