You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How may I help you?

USER: Can you please help me in booking my flight ticket from AUS to SEA?

ASSISTANT: Please provide your travel dates?

USER: My planned travel dates are Jan 09-11.

ASSISTANT: Do you have any preference?

USER: I prefer a direct flight. I want to fly in business class.

ASSISTANT: May I know your name?

USER: Myself, William Hall.

ASSISTANT: Sorry, there is no flight for your requirement.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thanks.