You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: My name is Margaret Hall, I want to book a flight from Washington to visit World Mobile Congress at Denver. Can you book a flight on 12/01?

ASSISTANT: Sure Margaret Hall, I will help you. Could you please share your return date?

USER: I will return on 12/03.

ASSISTANT: Ok, please intimate your travelling airport codes.

USER: My source point is DC-DCA and my destination is CO-DEN.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: There is a flight with your requirement, airline is UA with price 100 and single connection. Shall I proceed with booking?

USER: Please proceed with booking.

ASSISTANT: Your booking has been confirmed on name of Margaret Hall in UA 1010 airline.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us, have a nice day.