You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: My name is Nicole Green, I want to change my existing reservation due to postpone of my friend marriage.

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

USER: Ok.

ASSISTANT: We found a reservation on your name. Please let me know your updated trip dates.

USER: My departure day is 01/26, return day is 01/28.

ASSISTANT: may I know your airport codes?

USER: My source and destination airport codes are MA - BOS, IL - ORD.

ASSISTANT: UA airline with flight number 1012 is going on your way and the fare is 200. Shall I proceed?

USER: Proceed to booking, if it is a connecting flight.

ASSISTANT: Your booking has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.