You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to change my recent reservation, will you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know on whose name the ticket has been reserved formerly.

USER: Myself Kathleen Thomas.

ASSISTANT: I found a reservation on your name Kathleen Thomas, may I know your airport codes please?

USER: My airport codes are ATL and DCA?

ASSISTANT: Ok, can you please provide your travelling dates?

USER: My travelling dates are Sept 26 and Sept 28.

ASSISTANT: Ok, do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Sorry Kathleen Smith, there are no flights available on your requested dates.

USER: Ok, not an issue,. Thank you for your information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.