You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need to travel from BOS to DTW, can you help me in doing that?

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

USER: My trip dates are Mar 15 to 17.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Any other requirements to be met?

USER: No.

ASSISTANT: May I know your good name?

USER: David Lee here.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.