You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Roberts Smith.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, may I know your travel dates?

USER: I am departing on 06/13 and return on 06/15.

ASSISTANT: How much you can afford for this ticket?

USER: I can afford 1000.

ASSISTANT: Do you prefer economy or business class?

USER: I am ok with any class.

ASSISTANT: We found a flight on your details with airline Southwest, flight number: 1006. Shall I book this ticket?

USER: Please proceed for booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you.