You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please help me to book my flight ticket from BOS to DCA?

ASSISTANT: Sure, when do you want to start and return on?

USER: Thank you very much. I will start my journey on Dec 29th and return back on Dec 31st.

ASSISTANT: Do you need any stopover flight?

USER: Yes, I prefer for a connecting flight.

ASSISTANT: Can I know your good name?

USER: My name is Amy Davis.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: Sad to hear that. Thank you for the information.

ASSISTANT: Thank you.