You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please help me with booking a flight ticket from IAD to SFO?

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

USER: My travelling dates are from Dec 27-29.

ASSISTANT: Do you have class preference?

USER: I prefer economy class.

ASSISTANT: Do you need connection limit?

USER: I prefer to fly in connecting flight.

ASSISTANT: May I know your name?

USER: Sure, Gregory Carter here.

ASSISTANT: We found United Airline with fare 200 and flight number is 1008 with connecting flight. Shall I proceed with the booking?

USER: You can proceed with booking.

ASSISTANT: Your booking is done.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.