You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Susan Lewis. Can you help me booking a flight ticket from ATL to PHX?

ASSISTANT: Sure, may I know your trip dates?

USER: I will start on 02/01 and return on 02/03.

ASSISTANT: Do you have any other requirements?

USER: I need a direct flight.

ASSISTANT: Ok, please wait.

USER: I am looking for a economy class.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: No problem, thank you for the information.

ASSISTANT: My pleasure.