You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Paul Gonzalez here.

ASSISTANT: How may I assist  you?

USER: I am looking for a flight with price below 1000. As I am planning to visit Chicago. Can you book it?

ASSISTANT: Sure, I am here to help you. Could you please let me know your travelling dates?

USER: My travel dates for my journey would be from 11/07 to 11/09.

ASSISTANT: May I know your airport codes?

USER: The airport codes for boarding the flight are DEN to ORD.

ASSISTANT: There is a flight-1004 of UA airlines, shall I proceed?

USER: Sure, you can proceed for the booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Welcome.