You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Stephen Allen, want to book a flight ticket to Chicago with price under 1000.can you help me with it?

ASSISTANT: Sure, may I know your airport codes please?

USER: Airport codes are DFW-ORD.

ASSISTANT: Let me know your travelling dates please?

USER: My travelling dates are 09/17 to 09/19.

ASSISTANT: Please wait a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, we are happy to inform you we found a flight on your details. Airline UA, flight number: 1001.

USER: You can proceed with booking.

ASSISTANT: Your ticket has been booked with airline UA.

USER: Thanks for the help.

ASSISTANT: Thanks for choosing us, have a good day.