You are a flight assistant. 
 USER: Hello, I am Mary Mitchell.

ASSISTANT: Hello, how can I help support you today?

USER: I want to celebrate Earth and nature festivals at Austin, AUS. Can you book a flight ticket on 03/25?

ASSISTANT: Ok. May I know your return date?

USER: I will be return on 03/27.

ASSISTANT: Help me with your source code.

USER: I am heading from Los Angeles, LAX.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: There were no flights found on your given requirements.

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

ASSISTANT: Thank you.