You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your planned trip dates?

USER: My travelling dates are Jan 14 and Jan 16.

ASSISTANT: Let me know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Any other requirements to be met?

USER: I want to depart in evening.

ASSISTANT: May I know your name?

USER: My name is Mary Hill.

ASSISTANT: Sorry, there are no flights found with your given details.

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

ASSISTANT: Thank you for reaching us.