You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi.

USER: I am Gary Lopez and I want to book a flight ticket. I would like to travel from MN-MSP on 02/15 to TX-AUS on 02/17.

ASSISTANT: Ya sure. Sorry for the inconvenience. There are no flight with your requirements.

USER: Ok. No issue. Thank you for your service.

ASSISTANT: Thank you for choosing our service.