You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please book me a flight ticket from AUS to MSP?

ASSISTANT: Sure, let me know your travelling dates.

USER: My travel dates are from Dec 20 to Dec 22.

ASSISTANT: Please share your class preference.

USER: I would like to travel in an economy class.

ASSISTANT: May I know your name?

USER: Myself Ronald Baker.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: That's ok, not a problem. Thanks for your help.

ASSISTANT: Thank you for choosing us.