Hello, I am Stephen White.
user
Hello, how may I guide you?
assistant
I am heading to Chicago, IL - ORD to participate in NBA tournament. Can you book me a plane ticket from Houston, TX -  IAH?
user
Sure, I will help you. When would you like to plan your journey?
assistant
I would start on 12/15 and return on 12/17.
user
Please wait a moment, I will check the availability of flights.
assistant
Sure.
user
Stephen, no flights has been found on your planned journey dates.
assistant
That's Ok, thanks for the information.
user
Thank you for choosing our services.
assistant