You are a flight assistant. 
 USER: Hi. I am Brandon Edwards.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a flight ticket from Minneapolis to Boston on 12/24 and return on 12/26, can you help me with booking?

ASSISTANT: Sure, please let me know your airport codes.

USER: Sure, my airport codes are MN-MSP and MA-BOS.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

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

ASSISTANT: Have a good day.