You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Anthony Harris.

ASSISTANT: May I know your good name, Please? How can I assist you, Anthony Harris?

USER: I need to book a flight ticket with direct flight.

ASSISTANT: OK. May I know your airport codes, Please?

USER: I would like to visit Lady Bird Lake at AUS from LGA.

ASSISTANT: May I know your travel dates, Please?

USER: My dates are 08/25 and 08/27.

ASSISTANT: May I know, Do you have any restriction on price limit?

USER: Price limit is 5000.

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 sharing your information.

ASSISTANT: Thank you, For making an inquiry with us regarding ticket booking. Have a nice day.