You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please aid me to book a flight from DCA to BOS?

ASSISTANT: Sure, please let me know your connection limit?

USER: I need a direct flight.

ASSISTANT: May I know your good name?

USER: Mark Moore here.

ASSISTANT: Could you please share your journey dates?

USER: Sure, my travelling dates are Mar 13 - Mar 15.

ASSISTANT: Are there any more specifications?

USER: No.

ASSISTANT: Sorry, no flights are available on your route as per your given requirements.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for reaching us.