You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation. Can you please help me in that?

ASSISTANT: Yes, can you share me your name?

USER: Myself Kenneth Lewis.

ASSISTANT: I have found reservation on your name. Can you share me your new travelling dates?

USER: My trip dates are Sept 23 to Sept 25.

ASSISTANT: Could you tell me your nearest airport codes?

USER: My airport codes are ATL to CLT.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you.