You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dennis Anderson here.

ASSISTANT: Dennis, how can I assist you?

USER: Can you please help me out in booking the ticket from Denver to San Francisco?

ASSISTANT: Sure, please provide your itinerary dates.

USER: Sure, my travel dates are 01/22 and 01/24.

ASSISTANT: May I know your airport codes?

USER: Sure, I want to depart from my nearest airport, DEN and land at SFO.

ASSISTANT: Please hold on for a while.

USER: Sure, I'll be online.

ASSISTANT: Delta airlines with flight 1006 is available.

USER: May I know the ticket fare please?

ASSISTANT: Ticket fare is 200.

USER: That's fine, please proceed for booking.

ASSISTANT: Your ticket is confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.