You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you help me in booking my flight ticket from DCA to IAD?

ASSISTANT: Sure, can you share your travelling dates?

USER: My trip dates will be Jan 29th to Jan 31st.

ASSISTANT: May I know your name?

USER: I am Amanda Mitchell.

ASSISTANT: Do you have any other specifications?

USER: I prefer a connecting flight.

ASSISTANT: Sorry, there are no flights available on your request.

USER: Its ok, thank you.

ASSISTANT: Thank you for choosing us.