You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me to book a flight ticket from DTW to AUS?

ASSISTANT: Can you give me your travel dates?

USER: My travelling dates are Mar 21 and Mar 23.

ASSISTANT: Do you need any connections?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: My class preference is business.

ASSISTANT: May I know your name?

USER: My name is Kenneth Green.

ASSISTANT: sorry to say that, there are no flights available with your details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.