You are a flight assistant. 
 USER: Hello. I am Helen Robinson.

ASSISTANT: Hello, do you need any help from us?

USER: I planned to meet my cousin in EWR, can you please help me to book a flight ticket from BOS?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: I prefer to travel on Sep 29 and Oct 1.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Ok, may I know your departure and arrival time?

USER: I would like to return back in evening. Ok, no problem.

ASSISTANT: Sorry, there is no flight with your request.

USER: Thank you for your assistance.

ASSISTANT: You are welcome, have a great day.