You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Can you please help me in changing my existing reservation. Can you please help me for this?

ASSISTANT: Sure, can you share your good name please?

USER: Myself Catherine Taylor.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation on your name to change.

USER: Not a big deal, anyhow thank you very much for checking the reservation status.

ASSISTANT: Thank you for approaching us.