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

ASSISTANT: Hello, how can I help you today?

USER: Due to sudden changes, my exams has been postponed. Can you please change my reservation?

ASSISTANT: Sure, we found a reservation on your name, could you please let me know your new reservation details.

USER: My new travelling dates will be on 02/28 to 03/01. My airport codes are from SEA to ATL.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for opting us.