You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: Can you aid me in booking a flight ticket from BOS to PHL?

ASSISTANT: May I know your journey dates?

USER: I am planning to start on Mar 18th and return back on Mar 20th.

ASSISTANT: Do you need a connecting flight?

USER: Make sure that it is a direct flight.

ASSISTANT: May I know your name please?

USER: I am Laura King.

ASSISTANT: Do you have any other requirements?

USER: I prefer to travel in economy class.

ASSISTANT: There are no flights available for your journey.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for choosing our services.

USER: You are welcome.