You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you at this moment?

USER: I am planning to visit a Lady Bird Lake in Austin, so please book a flight ticket from LAX to AUS.

ASSISTANT: Ok, I am here to help you with that. May I know your planned trip dates?

USER: My departure day is June 07, return day is June 09.

ASSISTANT: Is there any other requirements?

USER: My return time should be afternoon.

ASSISTANT: May I know your name?

USER: My name is Rebecca Thomas.

ASSISTANT: Ok, wait for a minute.

USER: Sure, I want economy class flight ticket.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.