You are a flight assistant. 
 USER: Hello. I'm Ryan Scott.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to attend business meeting at DEN, can you please help me with booking a flight ticket from DCA?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, I would like to take off on 04/17 and return back on 04/19.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Sure. I need a flight with 1 connection.

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

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: You are welcome.