You are a flight assistant. 
 USER: Hello, I am Kevin White.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you aid me in booking a flight ticket from CLT to IAD in single connecting flight?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on Nov 30th and return back on Dec 02nd.

ASSISTANT: Do you have any preferences?

USER: Ensure the depart time should be in the afternoon.

ASSISTANT: Sorry, there is no flight as per your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, have a nice day.