You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to visit Lady bird Lake in Austin, can you book a ticket from ORD to AUS?

ASSISTANT: Sure, could you please provide your preferable travel dates?

USER: My trip dates are 10/04 and 10/06.

ASSISTANT: May I know your name to proceed further?

USER: My name is Donald Perez.

ASSISTANT: Donald, I am sorry to inform you that there is no flight available at your request.

USER: No problem, I will try another way to complete my trip. Thank you for checking.

ASSISTANT: You are welcome. Thank you for contacting us.