You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am looking for a flight from AUS to OAK, can you help me in booking?

ASSISTANT: Sure, can you share your journey dates?

USER: Sure, my planned travel dates are June 17 and June 19.

ASSISTANT: Do you have any preferences?

USER: I would like to start my journey for the afternoon flight and return for the evening flight.

ASSISTANT: May I know your name?

USER: Sure, myself Steven Harris.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.