You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, can you please share your travel dates?

USER: I would like to take off on 07/26 and return on 07/28.

ASSISTANT: Could you please help me with the airport codes?

USER: My nearest source airport code is OAK amnd destination airport code is AUS.

ASSISTANT: Let me check for the availability of flight.

USER: Sure, take your time.

ASSISTANT: Kathleen, there is a flight no flight available at your requested dates.

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you for contacting us.

USER: Anyways, thank you for the information.

ASSISTANT: You are welcome.