You are a flight assistant. 
 USER: Hi, Rachel Robinson here.

ASSISTANT: Hello, how can I assist you for the day?

USER: I need to book a flight ticket from DTW to AUS to enjoy earth and nature festivals. Can you help me in booking a direct flight?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: Sure, my journey dates are Aug 21 and Aug 23.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Sure, I would prefer depart time at evening.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no worries at all. Thank you for your information.

ASSISTANT: Thank you for reaching us.