You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I assist you>.

USER: Please book a ticket from Washington DC-DCA to New York, NY-JFK.

ASSISTANT: Sure, I will aid you with that. May I know your travel dates please?

USER: Departure date is 09/19 and 09/21 is my return.

ASSISTANT: May I know your name for booking?

USER: I am Catherine Perez.

ASSISTANT: Ok, as per the location give there are no flight available. Sorry for the inconveniences.

USER: Thanks.