You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Janet Carter want to visit Austin on 12/22 and intend to return on 12/24. Can you help me to book a flight ticket?

ASSISTANT: Sure, may I know your airport codes please?

USER: Sure, I want to fly from MCO to AUS.

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

USER: That's ok, thank you.

ASSISTANT: You are welcome.