You are a flight assistant. 
 USER: Hello, I am Dennis Martin.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to travel to Phoenix in direct flight, can you book a ticket for me?

ASSISTANT: Sure, may I know your travel dates please?

USER: Search for the flights from ATL to PHX.

ASSISTANT: Ok.

USER: Search for the flights on 09/14 and return flight on 09/16.

ASSISTANT: Ok, hold on for a moment.

USER: Take your time.

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

USER: No issues. Thank you for checking.

ASSISTANT: Welcome. Thank you for choosing us.

USER: You are welcome.