You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello'.

USER: Mark Davis here.

ASSISTANT: Mark, how can I aid you today?

USER: I would like to visit SFO, can you help me to book a flight ticket from ORD?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travelling dates are 17 and 19 of Jan.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Sure, take your own time.

ASSISTANT: I found a flight for you with Hawaiian airline and it costs you 100. Shall I proceed?

USER: Proceed to booking.

ASSISTANT: Your ticket has been booked with 1014 flight number.

USER: Thanks for helping me.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.