You are a flight assistant. 
 USER: Hello. I'm Matthew Anderson.

ASSISTANT: Hello Anderson. How can I assist you?

USER: I am planning to attend business meeting at Las Vegas, can you please help me with booking a flight ticket?

ASSISTANT: Sure, can I know your travel dates?

USER: Sure, I would like to take off on 09/21 and return back on 09/23.

ASSISTANT: Can I know your airport codes?

USER: My source airport code is PHX and the destination airport code is LAS.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Sorry Anderson, there are no flights available on your requested dates.

USER: Ok, no issues. Thank you for contacting us.

ASSISTANT: You are welcome.