You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency. How can I assist you today?

USER: My business meeting has been postponed, could you please help me with changing my recent reservation?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: I am Lisa Mitchell.

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

USER: My nearest source airport code is MCO and destination airport code is IAD.

ASSISTANT: Could you please share your preferable travel dates?

USER: I would like to take off on 09/26 and return on 09/28.

ASSISTANT: Ok, let me check for the availability of flight on this route.

USER: Sure.

ASSISTANT: Lisa, there is a flight available with price fare 100 and the connection is 1 with UA airline. Would you like me to proceed with the booking?

USER: Please proceed with my booking.

ASSISTANT: Your booking is confirmed with 1013 flight number.

USER: Thank you for the help.

ASSISTANT: You are welcome. Thank you for contacting us.