Hi, I am Alexander Walker.
user
Hello, How exactly I can serve you the best today?
assistant
I want to book a flight ticket to Las Vegas with price under 500. Can you please help me with it?
user
 Sure, I would be happy to help you. Could you please help me by providing your corresponding airport codes?
assistant
Airport codes are OAK-LAS.
user
What are your planned trip dates?
assistant
Trip dates are 09/14 and 09/16.
user
Ok, please wait a moment, let me search a flight for you.
assistant
Ok.
user
There is no flight found in search to your route on your dates of journey.
assistant
Ok, no oissues.
user
Thank you for choosing us.
assistant
Thanks for the help.
user