You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please assist me to book a flight ticket from BOS to DTW?

ASSISTANT: May I know your trip dates?

USER: Thank you. I am willing to travel on these dates Oct 16 and Oct 18.

ASSISTANT: Do you have any connecting limit preferences?

USER: I would like to travel in a single connecting flight.

ASSISTANT: May I know your name to proceed further?

USER: My name is Debra Moore. I need a flight which is departing in the evening time.

ASSISTANT: Is there any other concern of your travel?

USER: No, I have mentioned all my requirements.

ASSISTANT: Thank you. Please be on hold for a while.

USER: Ok, take your time.

ASSISTANT:  Sorry, no flights found as per your preferences at the moment.

USER: It's ok, anyways thank you for your quick response.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.