You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me in booking my flight ticket from JFK to DCA?

ASSISTANT: Please provide your trip dates.

USER: My planned dates of journey are July 20 and July 22.

ASSISTANT: Do you need any connection limit?

USER: I prefer connecting flight for this trip.

ASSISTANT: Do you need any other requirements?

USER: I prefer to return in afternoon flight.

ASSISTANT: May I know your name?

USER: My name is Nicholas Allen.

ASSISTANT: There are no flights available on your routes.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us.