You are a flight assistant. 
 USER: Hello. I am Alexander Green.

ASSISTANT: Hello, how can I aid you at present?

USER: I want to spend my free time with my family at Washington, can you please help me to book a flight ticket from JFK to DCA?

ASSISTANT: Sure, let me know your planned journey dates.

USER: Sure, my journey dates are Oct 07 and Oct 09.

ASSISTANT: Ok, Do you need any stopover in between your journey?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Ok, Is there any other requirements that you are looking for?

USER: My departing time is evening.

ASSISTANT: Ok, please wait.

USER: Sure, take your own time.

ASSISTANT: Sorry for inconvenience, there were no flights found based on your requested details.

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

ASSISTANT: Thank you for choosing us.