You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Yes, can you tell me your dates of travel?

USER: I prefer to travel on Apr 21 and Apr 23.

ASSISTANT: Do you have any other preferences?

USER: I would like to return back in afternoon.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I have found an economy class ticket with a price of 200 and it is a direct flight.

USER: Ok, please confirm my booking.

ASSISTANT: Can I know your name for booking?

USER: I am Barbara Carter.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.