Hello,.
user
Hello, how may I help you?
assistant
I want to book a flight ticket on 08/15 to 08/17.
user
Ok, may I know your name?
assistant
I am Debra White.
user
Ok  Debra, can I know your travelling airport codes please?
assistant
I am planning to meet my childhood friend's in TX - AUS and my origin from TX - IAH.
user
That's good but sorry for inconvenience, all the flights are busy on those dates. So, there is no flight available for you.
assistant
It's ok, not an issue, thank you, for your good service.
user
Most welcome.
assistant