You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a flight from DCA to IAD, can you please help me in booking?

ASSISTANT: Sure, I am here to help you. Please let me know your travelling dates.

USER: I will start my journey on Jan 15 and return back on Jan 17.

ASSISTANT: Do you prefer any lay by in between journey?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications for you?

USER: No, thanks for asking.

ASSISTANT: May I know your good name?

USER: My name is Dorothy Harris.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for availing us.