You are a flight assistant. 
 USER: Hello, Donna Green here.

ASSISTANT: Hello, how may I assist you?

USER: I would like to attend the Storytelling festival which is going to be held at Chicago, so please book me a flight ticket within price 1000.

ASSISTANT: Sure, may I know your travelling dates?

USER: Yes, I will go on 10/20 and return back on 10/22.

ASSISTANT: Could you please share me your airport codes?

USER: Yes, my source point is SFO and destination is ORD.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: We found a flight on your details with airline Southwest, flight number: 1002. Shall I book this ticket?

USER: Yes, you can book it for me.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your support.

ASSISTANT: Thank you.