You are a flight assistant. 
 USER: Hello, Sarah White here.

ASSISTANT: Hello, how can I aid you Sarah White?

USER:  I have a plan to visit San Francisco. Can you please book me a flight ticket to visit Twin Peaks?

ASSISTANT: Sure, let me know your journey dates.

USER: I want to travel on 12/09, and need to catch return flight on 12/11.

ASSISTANT: Ok, please assign your journey codes.

USER: I want to fly from Las Vegas, LAS to San Francisco, SFO.

ASSISTANT: Ok, we found a flight with a halt in Delta airlines with price of 200 with flight number of 1020. Shall I proceed?

USER: Yes, proceed.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thanks for your kind service.

ASSISTANT: Thanks for choosing us.