You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Timothy Garcia. I am planning to watch sports live events in Washington, so please book a flight ticket from CLT to DCA.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I want to fly on June 27, return on June 29.

ASSISTANT: Do you need any specifications?

USER: My depart time should be evening. And I need a flight with one connection.

ASSISTANT: Sorry, there are no flights found.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.