You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

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

ASSISTANT: Sure, let me know your travel dates?

USER: My travelling dates are Feb 19 and Feb 21.

ASSISTANT: Would you like any break in your journey?

USER: Yes, I need a break in between my journey.

ASSISTANT: Any other preference?

USER: No, thanks for asking.

ASSISTANT: Can you share your name to proceed further?

USER: My name is Joseph Evans.

ASSISTANT: Sorry, no flights found as per your requirement.

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

ASSISTANT: Thank you for contacting us.