Hi.
user
Hello. How may I assist you?
assistant
I am Lisa Hill. I want to book a ticket from ATL to IAH, can you help me?
user
Ok, can I have your dates of travel?
assistant
My travel dates are 09/25 and 09/27.
user
 Lisa Hill, sorry to inform you there is no flight on your preferable dates.
assistant
No problem, thanks for checking.
user
Welcome, have a nice day.
assistant