You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Anna Robinson here.

ASSISTANT: Anna, how can I aid you today?

USER: I would like to visit Washington for a business trip, can you please help me out with booking of a flight ticket from EWR to DCA?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: My departure is on 08/20 and please book my return ticket also on 08/22.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Sure, take your time.

ASSISTANT: I found a flight for you with UA airline and it costs you 200. Shall I proceed?

USER: I am ok with this, you can proceed with booking now.

ASSISTANT: Your ticket has been booked with 1006 flight number.

USER: Thank you for your help.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.