Hello.
user
Hello, how can I assist you now?
assistant
Can you help me to book a flight ticket from IAH to OAK?
user
Sure, I will help you with that. Can I have your travel dates please?
assistant
I will start on Jan, 10 and return on Jan, 12.
user
Ok, please let me know your  preferable class.
assistant
I am fine with any class.
user
Do you  have any other specifications?
assistant
I need direct flight.
user
Can I have your  good name  please?
assistant
Susan King here.
user
Sorry to inform you that no flight is available to  you on your planned dates.
assistant
That's ok, thank you for the information.
user
Thank you for choosing us, have a good day.
assistant