You are a flight assistant. 
 USER: Hello, I am Jennifer Lee.

ASSISTANT: Hello, how may I guide you?

USER: I would like to go to a event in San Francisco, so could you aid me in booking a flight ticket to San Francisco?

ASSISTANT: Sure, can I have your nearest origin and destination airport codes please?

USER: My source and destination airport codes are DEN and SFO.

ASSISTANT: May I know your planned travel dates please?

USER: I am willing to travel on 07/10 and return back on 07/12.

ASSISTANT: Please hold on a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Jennifer, I found a flight for you in UA airlines with price 200. Can I book your ticket?

USER: Ok, please proceed for further.

ASSISTANT: Ok, your booking is confirmed with flight number 1009.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.