You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I didn't got window seat due to late check in, can you help me to change my existing reservation?

ASSISTANT: Sure, I will help you with that, may I know your name please?

USER: Thanks. Sure, my name is Katherine Robinson.

ASSISTANT: Please hold on for a moment to check your reservation status.

USER: Ok.

ASSISTANT: Robinson, I found your reservation, may I know your new airport codes?

USER: My airport codes are ATL and ORD.

ASSISTANT: Please share your travelling dates?

USER: I want to travel from 02/27 to 02/29.

ASSISTANT: Do you have any requirements?

USER: I want a direct flight to Atlanta.

ASSISTANT: Sorry to say this, no flights as per your details.

USER: It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: My pleasure.