Hello,.
user
Hello, how can I help you?
assistant
I am Andrew Jackson. I want to travel from  San Francisco, CA-SFO to Las Vegas, NV-LAS.
user
Sure, can you provide me your journey dates?
assistant
OK, I would like to travel on July 31 and return on Aug 2.
user
Do you have any other requirements?
assistant
 Yes, I prefer 1 connection with price limit  of 1000.
user
Please wait a moment I will get back to you.
assistant
OK, I will.
user
Sorry to inform you, unfortunately we did not find any matching flights for you.
assistant
That's fine, Thank you for the information.
user
Thanks for choosing us, Have a nice day.
assistant