You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Brandon Jackson.

ASSISTANT: How may I serve you?

USER: I would like to visit Austin, can you help me for booking a flight ticket from ATL to AUS?

ASSISTANT: Ok, now please share your travel dates?

USER: My travelling dates are 11/25 and 11/27.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: That;s ok, thank you for checking.

ASSISTANT: Thank you.

USER: Welcome.