You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to book the flight ticket from EWR to BOS. Can you find a flight ticket for me?

ASSISTANT: Sure, I am here to help you out. May I now your travel dates please?

USER: Ok, my planned trip dates are on Feb 17 and return on Feb 19.

ASSISTANT: Can you please share your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No, thanks for asking.

ASSISTANT: May I know your name please?

USER: Ok, I am Kevin Lee.

ASSISTANT: Kevin Lee, there are no flights available in your route with your preferences.

USER: Ok, not a problem. Thank you for your help.

ASSISTANT: Thank you for choosing us.