You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Donna Johnson. I want to go from ATL to LAX to meet my friends, can you please book me a ticket?

ASSISTANT: Sure, please give me a minute. Can I know your travel dates?

USER: I would like to travel on 05/31 and 06/02.

ASSISTANT: Donna, there is no flight available on your requested dates.

USER: Ok, no problem. Thank you.