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 IAD to SFO?

ASSISTANT: May I know your trip dates?

USER: My travel dates are Nov 17 and Nov 19.

ASSISTANT: Is there any connection limit?

USER: I prefer connecting flight for this trip.

ASSISTANT: Any more requirements?

USER: No, thanks for asking.

ASSISTANT: May I know your name?

USER: I am William Lopez.

ASSISTANT: American Airlines providing connecting flight in the economy class with fare 100, shall I proceed for booking?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed with flight number 1004.

USER: Thank you.

ASSISTANT: Thank you for approaching us.