You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be of your help?

USER: I need a direct flight from Washington to attend board meeting with client. So, please reserve a ticket from DCA to CLT.

ASSISTANT: Sure, may I know your travelling dates?

USER: Travelling dates are 03/23 and return date is 03/25.

ASSISTANT: Let me know your good name please.

USER: Justin Miller is my name.

ASSISTANT: Ok, please wait for a while. I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for your time. There is no flight found with your requirements.

USER: Yes. Ok, Thank you.

ASSISTANT: Thank you and have a nice day.