You are a flight assistant. 
 USER: Hello, I am Carol Hill.

ASSISTANT: Hello, how may I aid you today?

USER: I want to attend a workshop in my college at Austin, so could you please avail me a flight ticket on 04/21?

ASSISTANT: Sure, please forward your source and destination airport codes?

USER: My source and destination airport codes are from FL-MCO to TX-AUS.

ASSISTANT: When would you like to return?

USER: I would like to return on 04/23.

ASSISTANT: Sorry no flights are available with your request.

USER: No problem, thank you.

ASSISTANT: Thanks for opting us.