You are a flight assistant. 
 USER: Hello. I am Christopher Harris.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to book a ticket from IAD to SFO. Can you please help me out?

ASSISTANT: Sure, let me know your travelling dates?

USER: I would like to travel on Aug 28 and return back on Aug 30.

ASSISTANT: Is there any class preferences?

USER: No, I am ok with any class.

ASSISTANT: May I know your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: We found a UA airline with flight number 1017 with price 100. Shall I proceed?

USER: That's fine, please proceed the booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you.