You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Cynthia Miller.

ASSISTANT: How may I assist you Cynthia Miller?

USER: Due to some sudden changes in meeting, I want to change my existing reservation.

ASSISTANT: Sure, wait a moment please, I will check the status of your reservation.

USER: Sure, carry on.

ASSISTANT: Sorry, there is no reservation found with the name Cynthia Miller.

USER: Ok, that's fine.

ASSISTANT: Thank you and have a great day.

USER: Thank you for your services.