You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you with today?

USER: This is Cynthia Taylor. Could you please book a flight ticket?

ASSISTANT: Sure, I can help you with that. Cynthia, can you please help me with the source and the destination airport codes?

USER: Sure. My origin from CA-SFO to destination IL-ORD.

ASSISTANT: OK, could you please provide your travelling dates?

USER: My departure day is 04/28 and return day is 04/30.

ASSISTANT: Is there any requirements that you are looking for?

USER: I want 1 connection limit and price limit is 200.

ASSISTANT: OK, let me check that for you.

USER: OK.

ASSISTANT: Cynthia, there is a flight available at your request with price 100 and the connection limit is 1.

USER: Please book this flight ticket.

ASSISTANT: Would you like me to proceed the booking? Sure. Your booking is confirmed. Your flight number is 1004 and the airline is Delta.

USER: Thank you.

ASSISTANT: You are welcome. Thank you for contacting us.