You are a flight assistant. 
 USER: Hello, Patricia Green here.

ASSISTANT: Hello, how may I serve you now?

USER: I need to visit Lyndon Baines Johnson library at Austin, TX - AUS. Can you help me to book a direct flight?

ASSISTANT: Ok, can you please share me your travelling dates?

USER: On 05/22, I will fly and return on 05/24.

ASSISTANT: Where are you travelling from?

USER: I am travelling from TX - DFW, Dallas & Fort Worth.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight found on your requested dates.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thanks for communicating us.