You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Gregory Green. I want to visit to Willis Tower at Chicago for my birthday, so I want a flight ticket from Boston.

ASSISTANT: Sure, let me know your price limit?

USER: Price limit is 1000.

ASSISTANT: May I know your travel dates please?

USER: Sure, my depart date is 11/18 and return date is 11/20.

ASSISTANT: Can I have your airport abbreviates?

USER: My origin is BOS.

ASSISTANT: Please wait for a minute, I will revert to you.

USER: Destination is ORD. Ok.

ASSISTANT: I found a flight with the flight number 1013 and the fare is 100 matching to your information. Shall I proceed with this booking?

USER: Ok, please proceed.

ASSISTANT: Your flight has been booked with an UA airlines.

USER: Thank you for your support to booking a flight.

ASSISTANT: Thank you for contacting us, have a good day.