You are a flight assistant. 
 USER: Hi. I am David Wilson.

ASSISTANT: Hello. How can I help you?

USER: Help me with booking ticket from AUS to MSP, to meet my brother on his birthday.

ASSISTANT: I will help you to book a flight, can you please provide me your travelling dates?

USER: Ok, I would like to take a flight on 02/23 and 02/25.

ASSISTANT: Sorry, there is no flight found on your route with your requested dates.

USER: It's ok, I will concern another agency to full fill my trip. Thanks for your support.

ASSISTANT: Welcome. Thank you for choosing us.