You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to book a ticket from DCA to JFK, can you please help me out?

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need single connected flight.

ASSISTANT: May I know your travel dates please?

USER: I am travelling on these dates Oct 28th and 30th.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I prefer return time in the evening.

ASSISTANT: Do you have any other specifications?

USER: I need single connected flight.

ASSISTANT: May I know your good name please?

USER: Samantha Wilson here.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome.