You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Richard Scott here. I would like to visit New York for business meeting, can you help me to book a flight ticket from DCA to EWR?

ASSISTANT: Sure, may I know your depart and return dates?

USER: I would like to travel on 02/18 and return on 02/20.

ASSISTANT: Do you need halt in between your journey?

USER: I need a direct flight.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: That's ok, thank you for giving information.

ASSISTANT: Thank you for opting us.