Hi. I am John Parker.
Hello, how may I assist you?
 I want to book a flight ticket to New York-LGA  to visit Golden Gate bridge, so help me to find a best flight.
Sure, may I know your journey dates?
I planned my trip on 12/13 to 12/15.
May I know your source code?
My source is Houston-HOU. I changed my plan I will start from IAH.
Ok, please let me check with your new codes.
Sure.
There is a flight-1026 by Spirit airlines available for you with 1 connection at the price of 200. Can I book it for you?
You can reserve it.
Your ticket is confirmed, thank you for choosing our services.