You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to attend a workshop at New York, please help me in booking a ticket from DCA to JFK.

ASSISTANT: Please provide your trip dates.

USER: My trip dates are on Jan 14 and Jan 16.

ASSISTANT: Do you need any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Do you have any other specifications?

USER: No more specifications, please find the availability of flights.

ASSISTANT: May I know your name?

USER: My name is Dennis Nelson.

ASSISTANT: There are no flights available on your routes.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.