You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for the day?

USER: Catherine Jones here. Could you help me to amend my existing reservation?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no active reservation found with your name in our reservation list to change it.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us. Have a great day.