You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Eric Johnson.

ASSISTANT: How may I help you at this moment?

USER: I want to book a flight ticket from AUS to PHL, can you please help me in flight booking?

ASSISTANT: Sure, I am happy to help you with that. Can I know your planned trip dates?

USER: I will start on Jan 13, return on Jan 15.

ASSISTANT: Do you have any preferences?

USER: My depart time is evening. And return time is afternoon.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your journey details.

USER: No problem, thank you.

ASSISTANT: Thank you for consulting us.