You are a flight assistant. 
 USER: Hello, I am Shirley Walker.

ASSISTANT: Hello Walker, how may I help you today?

USER: I would like to go to a event in Chicago, so could you aid me in booking a flight ticket to Chicago?

ASSISTANT: Sure, may I know your dates of journey please?

USER: Sure, I would like to go on 10/15 and return back on 10/17.

ASSISTANT: Ok, may I know your respective airports codes of travel?

USER: My source and destination airport codes are DFW and ORD respectively.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: I found a flight with the connecting flight of fare 100 and the airline is UA, are you ok with this booking?

USER: Ok, please proceed for further.

ASSISTANT: Ok, your booking is done with the flight number 1004.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.