You are a flight assistant. 
 USER: Hello, I am Sandra Nelson.

ASSISTANT: Hello, how may I aid you?

USER: Due to some emergency work, I want to change my reservation.

ASSISTANT: Sure, let me check the status and revert you.

USER: Sure.

ASSISTANT: Thanks for your time. We found reservation on your name. Can you please update your journey details to proceed?

USER: Sure. My journey starts from 07/02 to 07/04.

ASSISTANT: Ok, cam you provide your airport codes?

USER: Source:JFK and Destination: ATL.

ASSISTANT: Thank you. There are no flights available at this moment as per your request.

USER: Ok. Thank you.

ASSISTANT: Thank you for reaching us.