You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a flight on Feb 29 to visit Washington for short vacation. Can you book a flight for me?

ASSISTANT: Sure, I am here to help you with that. Can I know your airport codes?

USER: My source point is CLT and my destination is DCA.

ASSISTANT: Ok, do you have any other requirements?

USER: I want to travel in business class.

ASSISTANT: May I know your exact travelling dates?

USER: Please book me a connecting flight. I will return on Mar 2nd.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok, thank you for the information.

ASSISTANT: May I know your name for the documentation purpose?

USER: My name is Donald Martinez.

ASSISTANT: Thank you for reaching us.