Hi. John Thompson here.
user
Hello, can you please tell me how can I  assist you?
assistant
I want to travel in a direct flight to Chicago due to an emergency, can you help me in booking a ticket from Las Vegas?
user
Ok, may I know your trip codes?
assistant
Source airport code is LAS and destination airport code is ORD.
user
May I know your travel dates?
assistant
The travel dates are from 03/19 to 03/21.
user
Sorry Thompson, no flight found with your connection. Thank you for reaching us.
assistant
That's ok, no issues.
user
Ok.
assistant
Thank you for helping me.
user