You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Edward Miller, I would like to book a flight ticket from DCA to JFK. Could you help me for that?

ASSISTANT: Sure Miller, may I know the journey dates?

USER: My travelling dates are from 04/19 and to 04/21.

ASSISTANT: Ok, please hold on for a moment. Do you have any other requirements?

USER: My price limit should 200 and connections limit is 1.

ASSISTANT: Sorry to say this Edward, there are no flights matching your requirements.

USER: Ok, thank you for your information.

ASSISTANT: You are welcome. Have a nice day.