You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Catherine Johnson. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, please hold on for a moment.

USER: Ok, sure.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you, have a good day.