You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I need to attend a wedding, can you book a ticket from DEN to LAS?

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

USER: Sure, my planned departure and return travel dates are 20th and 22nd of September.

ASSISTANT: Ok, do you have any other specifications?

USER: Yes, I want to depart in the evening time in a direct flight only.

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

USER: Sure, take your own time.

ASSISTANT: I found a flight for you with Hawaiian Airlines and it costs you 900. Shall I proceed?

USER: That's fine, you can proceed for booking the ticket.

ASSISTANT: On whose name you would like to book this ticket?

USER: Book it on my name, Nancy Mitchell.

ASSISTANT: Your ticket has been booked with 1010 flight number Nancy Mitchell.

USER: Thank you so much for your help.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.