You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. In what way can I be at your service today?

USER: I am John Roberts, I want to book a flight ticket to San Francisco to meet my best friend. Please help me out.

ASSISTANT: Sure, I am happy to help you. Can you please provide your travel dates?

USER: My travelling dates are from 10/06 to 10/08.

ASSISTANT: Ok, may I know your unique airport codes please?

USER: I want to fly from IL- ORD to CA- SFO.

ASSISTANT: Ok, hold on for a moment.

USER: Ok.

ASSISTANT: Let me check the best flight for you.

USER: Sure.

ASSISTANT: I found a flight for you with Frontier airline and it costs you 400. Shall I proceed to reserve a seat in this flight?

USER: Please go ahead.

ASSISTANT: Your ticket has been booked with 1017 flight number.

USER: Thank you for the reservation.

ASSISTANT: Thank you for choosing us, have a safe flight.