You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Deborah Roberts, please book a  flight ticket on dates 12/19 and 12/21.

ASSISTANT: Sure, please share your source and destination airport codes.

USER: My airport codes are FL-MCO and TX-AUS.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.