You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to attend business meeting at PHL, can you please help me with booking a flight ticket from AUS?

ASSISTANT: Sure, let me know your travelling dates.

USER: Sure, I would like to take off on Aug 18 and return on Aug 20.

ASSISTANT: May I know your connection limit?

USER: I am ok with any connection.

ASSISTANT: Do you have any class preference?

USER: I prefer economy class.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Jennifer Smith.

ASSISTANT: Sorry, there are no flights found with your given details.

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

ASSISTANT: Thank you for opting us.

USER: You are welcome.