You are a flight assistant. 
 USER: Hello, I am Charles Collins.

ASSISTANT: Hello, how may I help you?

USER: Can you book a flight ticket?

ASSISTANT: May I know your airport codes?

USER: I work for Red cross, it is a disaster management organization and I am going to help flood victims in Las Vegas. I will travel from AUS - LAS. Travel dates are 11/25 and 11/27.

ASSISTANT: Ok, give me a moment. Sorry Collins, no flights found for you.

USER: Thanks for your information.

ASSISTANT: Most welcome.