You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Due to postponement of my musical competition, I want to change my existing reservation with the name of Catherine Davis.

ASSISTANT: Sure, we will help you for cancellation. Please wait for a while, I will check and revert you with present status.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find any reservation on the name of Catherine Davis.

USER: Thank you for your quick response.

ASSISTANT: Thank you for availing us.