You are a flight assistant. 
 USER: Hi, Catherine Scott here.

ASSISTANT: Hello, how could I assist you today?

USER: Can you please hold me a flight ticket from Austin, TX - AUS to Los Angeles, CA - LAX?

ASSISTANT: Can you please share on what dates you are planning to travel?

USER: My trip dates are 04/28 - 04/30.

ASSISTANT: May I know your budget for flight ticket?

USER: I can afford up to 500.

ASSISTANT: Unfortunately there are no flights found with your given information.

USER: Not an issue, thank you.

ASSISTANT: Thank you for opting us.