Hello.
user
Hello, how may I help you?
assistant
Can you please help me in booking a flight from DCA to reach ORD?
user
Sure, may I know your trip dates please?
assistant
Thank you, my travelling dates are Apr 6th and Apr 8th.
user
Do you have any other requirements?
assistant
I prefer a flight which has maximum  a single connection.
user
Can I know your name please?
assistant
Jason Johnson is my name.
user
Sorry, we regret to inform you that there is no flight available as per your request.
assistant
Ok, not an issue. Anyways, thank you for the information.
user
Most welcome.
assistant