You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Wilson.

ASSISTANT: How can I help you, Charles Wilson?

USER: I want to go Austin for attend a sports events in Austin, Can you help me for booking a flight ticket please?

ASSISTANT: Sure. May I know your travel dates, Please?

USER: I would like to travel on 09/16 to arrival on 09/18.

ASSISTANT: May I know your airport codes, Please?

USER: My source point is CA-OAK to destination point is TX-AUS with direct flight.

ASSISTANT: May I know, What is your price limit?

USER: I need price limit with in 500.

ASSISTANT: We are very sorry to inform you that, There are no direct flights available for your travel dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you, For making an inquiry with us regarding ticket booking.