Hello.
user
Hello, How can I aid you?
assistant
I am Richard Thompson, I want to book a flight ticket with price limit of 500.
user
Sure, May I  Know your travelling dates?
assistant
My departure day is 12/05, return day is 12/07. Connections limit is one.
user
Ok, Can you provide ma the airport codes?
assistant
My source and destinations are IL-ORD, TX-AUS.
user
Ok, wait a minute.
assistant
Sure.
user
Thanks for waiting. Unfortunately, There is no flight found with your request.
assistant
No problem, thanks for your service.
user
Ok, Thanks for contacting us.
assistant