You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in reserving me a flight from DCA to reach BOS?

ASSISTANT: Sure, may I know your trip dates please?

USER: Thank you, my planned journey dates are Aug 12th and Aug 14th.

ASSISTANT: Do you have any other requirements?

USER: I prefer a flight with single connection.

ASSISTANT: Can I know your name please?

USER: My name is Patricia Green.

ASSISTANT: Ok, please wait.

USER: Ok, sure.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Most welcome.