You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you at this moment?

USER: I want to attend a Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: My travelling dates are Aug 20 and Aug 22.

ASSISTANT: May I know your name?

USER: My name is Thomas Mitchell.

ASSISTANT: Can I know your airfield locations?

USER: My airport codes are DCA and IAD.

ASSISTANT: Do you have any other requirements?

USER: I prefer single connecting flight.

ASSISTANT: Ok, wait for a minute.

USER: Ok, I will wait.

ASSISTANT: United airlines are providing a flight having a connection limit 1 and ticket fare of 100. Shall I proceed with the ticket booking?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your flight ticket is confirmed in an economy class and the flight number 1000.

USER: Thanks for helping me.

ASSISTANT: Thank you for approaching us. Have a safe journey.