You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know how best I can help you today?

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

ASSISTANT: Sure, we are glad to help you in booking.  Kindly share your planned travelling dates to proceed further.

USER: I would like to fly on Dec 11 and return on Dec 13.

ASSISTANT: Can I have your name please?

USER: Myself Susan Hernandez.

ASSISTANT: Please let me know if you need a connecting flight.

USER: I need a single connection.

ASSISTANT: Could you please let me know if you have any comforts in between your journey?

USER: I would like to prefer an economy class.

ASSISTANT: Ok, please wait a moment I'll search best flight for you.

USER: Ok.

ASSISTANT: Thank you for waiting, we found an economy class ticket providing by UA airline with the flight number-1003 and the fare 100, shall I book the connecting flight?

USER: You can proceed to booking.

ASSISTANT: Your seat has been confirmed.

USER: Thank you.

ASSISTANT: It's pleasure to serve you.