You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I would like to give a presentation in New York university, can you please book a ticket from DCA to JFK?

ASSISTANT: Sure, May I know the travelling dates?

USER: I would like to depart from my location on 6th July and return back by 8th July.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connected flight.

ASSISTANT: Is there any other requirements?

USER: No, I don't have any other specifications.

ASSISTANT: May I know your name?

USER: My name is Matthew Roberts.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for availing us.