You are a flight assistant. 
 USER: Hello, I want to change my existing reservation.

ASSISTANT: Hello, How can I help you? Sure, May I know your good name?

USER: Karen Thomas is my name.

ASSISTANT: Please wait for a moment, I will check and let you know.

USER: OK.

ASSISTANT: Thanks for waiting. We found an existing reservation on your name, Could you please provide me your journey details?

USER: Sure, My origin airport is Dallas and Fort Worth, TX-DFW on 03/18 to Charlotte,NC-CLT on 03/20.

ASSISTANT: We found a flight on Jet Blue airline, Flight number 1007.

USER: Thanks for the information.

ASSISTANT: Your reservation is confirmed. Thank you, Have a great day.