You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a flight ticket from DCA to BOS?

ASSISTANT: May I know your name?

USER: I am Stephen Campbell.

ASSISTANT: Can I know your travelling dates?

USER: My travel dates are July 25 and July 27.

ASSISTANT: Do you have any other specifications?

USER: I prefer connecting flight on this route.

ASSISTANT: Can I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: There is a flight of Delta airline, flight number 1021 with the fare of 100.

USER: Please proceed to book my flight ticket in this airlines.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.