You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my reservation as my plan to visit my home is postponed. Can you help with that?

ASSISTANT: Sure, I can help you and can I know your name for further proceeding?

USER: My name is Melissa Rodriguez.

ASSISTANT: Thank you and I have found your reservation, can I know your new airport codes please?

USER: My source point is DCA and my destination is ATL.

ASSISTANT: Can I know your travel dates please?

USER: I will travel on July 25 and return on July 27.

ASSISTANT: Can I know your connection preference?

USER: I prefer a connecting flight.

ASSISTANT: Sorry to inform you that there is no flight obtained on your travel dates to change your previous flight ticket booking.

USER: Ok, thank you for the information.

ASSISTANT: You are most welcome and thank you for contacting us.