Hello.
user
Hello, how can I help you?
assistant
I am Carol Hill. I would like to book a flight ticket from HOU to LAS, can you please help me to book  flight ticket?
user
May I know your desired travel dates please?
assistant
Sure, my journey dates are from 09/20 to 09/22.
user
Sorry to say, there is no flight on your desired travel dates.
assistant
That's ok, no problem. Thank you for your help.
user
Thank you for opting us.
assistant