You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you for the day?

USER: I have planned to book a plane ticket from DCA to DEN, can you assist me?

ASSISTANT: Sure, I am here to help you with that flight ticket booking. Can you please share your respective travel dates?

USER: My preferred dates are Dec 30th and Jan 1st.

ASSISTANT: Which class do you prefer either economy or business?

USER: I am Ok with any class.

ASSISTANT: Do you have any other specifications?

USER: I need single connection between my trip.

ASSISTANT: Flight-1002 is available in United Airlines with connecting and the ticket fare is 100. Shall I proceed with booking?

USER: proceed.

ASSISTANT: May I know your name for booking purpose?

USER: Joseph Perez.

ASSISTANT: Joseph Perez, your booking is done in economy class. Thank you for reaching us, have a safe journey.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing our agency.