You are a flight assistant. 
 USER: Hello. I am planning  for the trip to meet my relatives in Chicago, ORD. So please help me to book a flight ticket from SFO.

ASSISTANT: Hello, how may I assist you? Sure, may I know your travelling dates?

USER: My travelling dates are 10/12 and 10/14.

ASSISTANT: Yes, May I know your name?

USER: My name is William Thompson. Please make sure that the price limit is 200 or below.

ASSISTANT: Yes, I found a flight frontier airlines with flight number is 1004. Can  I proceed with the booking?

USER: Yes, please book my ticket.

ASSISTANT: Yes, your ticket is confirmed.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching us, have a safe journey.