You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Raymond Allen. I am planning to change an existing reservation, due to health issue. Can you please change my ticket?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Thank you.

ASSISTANT: I have found your reservation, can you help me with your new airport codes?

USER: Sure, my source code is JFK and destination airport code is MSP.

ASSISTANT: May I know your travelling dates?

USER: I would like to travel on 11/25 and return back on 11/27.

ASSISTANT: Please wait for a moment.

USER: Make sure my connection limit should be 0.

ASSISTANT: Sorry, no flight with 0 connection.

USER: That's fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.