You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Scott Allen.

ASSISTANT: How may I aid you Allen?

USER: I am planning to visit Lady Bird Lake at Austin, could you please help me with booking a flight  ticket?

ASSISTANT: Sure, I will help you. Could you please provide your preferable dates that you want to travel?

USER: I would like to take off on 12/28 and return on 12/30.

ASSISTANT: Ok, may I know your nearest airport codes to proceed further?

USER: My nearest source airport code is ORD and destination airport code is AUS.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights available in your travel locations with your requested dates of travelling.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Thank you for contacting us, have a great day.