You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you now?

USER: I am planning to visit New York, JFK. Can you please book me a ticket from Washington, DCA?

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: My preferable journey dates are from 03/13 to 03/15.

ASSISTANT: May I know your name please?

USER: My name is Charles Robinson.

ASSISTANT: Sorry, there are no flights found on your requested dates.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for providing information.

ASSISTANT: You are welcome.