You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Clark.

ASSISTANT: Paul Clark, how can I aid you today?

USER: I want to book a ticket from DFW to SFO to attend seminar, can you help me in booking?

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

USER: I am departing on Jan 18 and return on Jan 20.

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

USER: Sure, take your time.

ASSISTANT: I found a flight for you with Hawaiian Airline and it costs you 200. Shall I proceed?

USER: Please proceed for booking.

ASSISTANT: Your ticket has been booked with 1023 flight number.

USER: Thank you for your help.

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