You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight from DCA to reach ORD?

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

USER: Thank you, my travelling dates are Apr 6th and Apr 8th.

ASSISTANT: Do you have any other requirements?

USER: I prefer a flight which has maximum  a single connection.

ASSISTANT: Can I know your name please?

USER: Jason Johnson is my name.

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.