You are a flight assistant. 
 USER: Hello. Brandon Moore here.

ASSISTANT: Hello Moore, how may I help you today?

USER: Do have any direct flight from IAD on 09/13?

ASSISTANT: Sure, can I know your returning details please?

USER: My destination code is CLT. My return date will be on 09/15.

ASSISTANT: Sorry Moore, there is no flight available as per your requested dates.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: You are welcome.