You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to book a ticket from DEN to IAD. Can you please help me out?

ASSISTANT: Sure, help me with the trip dates?

USER: I am planning to travel on Oct 06 and return back on Oct 08.

ASSISTANT: May I know your name please?

USER: My name is Rachel Lee.

ASSISTANT: Do you have any preferences?

USER: My depart time should be afternoon.

ASSISTANT: We found a flight in an airline United with 1001 number which departs in afternoon having a single connection price of 200. Shall I proceed to book?

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

ASSISTANT: Your flight ticket has been booked.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.