You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am James Hall. Please help me in booking my flight ticket from DEN to IAD?

ASSISTANT: May I know your desired travel dates please?

USER: My travelling dates are Dec 26 and Dec 28.

ASSISTANT: Please wait a while.

USER: Ok, sure.

ASSISTANT: Please share your connection limit.

USER: I need single connection flight.

ASSISTANT: There is a flight with connection limit 1 and fare 300, shall I proceed for booking?

USER: I need my depart flight during the evening time.

ASSISTANT: There is a flight which departs in evening. Shall I proceed for booking?

USER: Ok, please proceed with booking, If the depart time is evening.

ASSISTANT: Your ticket is booked, flight number 1021.

USER: Thank you.

ASSISTANT: Thank you for opting us.