You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Could you please book me a plane ticket from BOS to DCA?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I am planning to start on Aug 15th and return on Aug 17th.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a connecting flight only.

ASSISTANT: May I know your good name please?

USER: I am Eric Lewis.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for reaching us.