You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: My name is Anthony Lee, can you help me to book a flight ticket Phoenix, PHX to Atlanta, GA - ATL?

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

USER: Ok, please book for the dates 01/02 and 01/04 respectively.

ASSISTANT: Please wait for a mean while.

USER: Ok, please book if the price limit is 500.

ASSISTANT: Sorry Anthony, there is no flight found as per your travelling details.

USER: Ok, that is not a problem. Thank you for assisting me.

ASSISTANT: You are welcome.