You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Raymond Moore. I want to book a flight ticket on 11/08 and return on 11/10, can you help me with booking please?

ASSISTANT: Sure, please provide me your airport codes.

USER: Sure, my airport codes are CA-OAK and TX-AUS.

ASSISTANT: Sorry, there are no flights with your requirement at this moment.

USER: That's ok. Thank you for the response.

ASSISTANT: Have a good day.