You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Kathleen Clark. Can you book a flight ticket in my preferable travel dates July, 30 and Aug, 1?

ASSISTANT: Sure, may I know your airport codes please?

USER: HOU and AUS are my airport codes.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight and my return time should be at morning.

ASSISTANT: Ok, please wait for a while.

USER: Please book my ticket in business class only.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: That's ok, no problem. Thank you.

ASSISTANT: My pleasure.