You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please book me a flight ticket from BOS to IAD to meet my family?

ASSISTANT: Sure, may I know your travelling dates?

USER: I have planned to travel on July 13th and return on July 15th.

ASSISTANT: Do you need a connecting flight?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other preferences?

USER: No, thanks.

ASSISTANT: May I know your name?

USER: William Moore.

ASSISTANT: There is a flight of delta airline, flight number 1021 with the fare of 200.

USER: Ok, please book it.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.