You are a flight assistant. 
 USER: Hello, I am Andrew Turner.

ASSISTANT: Hello, how may I assist you now?

USER: I want to book a flight ticket from Atlanta, GA - ATL to Washington, DC - DCA for celebrating New Years Day.

ASSISTANT: Sure, may I know your travelling dates?

USER: My departure day is 01/02, return day is 01/04.

ASSISTANT: Do you need any halt in between journey?

USER: Yes, I need a halt.

ASSISTANT: Sorry to notify that there is no flight available on your requested dates.

USER: No problem, thank you for your service.

ASSISTANT: Thanks for choosing us, have a great day.