You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in booking the flight ticket from DFW to IAD?

ASSISTANT: Sure, can you please share your journey dates?

USER: I would like to travel on Dec 17 and return on Dec 19.

ASSISTANT: Do you have any connection limit?

USER: I need connecting flight.

ASSISTANT: Let me know your class preference?

USER: I prefer economy class.

ASSISTANT: May I know your name please?

USER: David Edwards here.

ASSISTANT: Ok, we found connecting flight 1018 in Delta Airlines with fare of 100. Shall I proceed with economy class?

USER: Please, proceed with the booking.

ASSISTANT: Ok, your flight ticket has been booked.

USER: Thank you for booking the flight ticket.

ASSISTANT: Thank you for reaching us.