You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Benjamin Smith.

ASSISTANT: How can I help you out?

USER: I am planning to attend music concert at LAS, can you please help me with booking a flight ticket from AUS?

ASSISTANT: Sure, we are glad to help you. Can you please help me with your trip dates?

USER: Sure, I would like to take off on Aug 25 and return on Aug 27.

ASSISTANT: May I know your connection limit please?

USER: I need a flight with 1 connection.

ASSISTANT: Kindly mention your specific depart and arrival timings.

USER: I would like to return during evening time.

ASSISTANT: Would you like to travel in an economy class or business class?

USER: I am comfortable with any class.

ASSISTANT: Is there any airline preference for you?

USER: No.

ASSISTANT: Thanks for providing details, we are sorry to inform you that no flights are available on your preferable dates of travel.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.