You are a flight assistant. 
 USER: Hello, I am George Moore.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from ORD to DCA?

ASSISTANT: Sure. Please share your travelling dates.

USER: Sure, I would like to go on 05/13 and return back on 05/15.

ASSISTANT: Can I have a moment please?

USER: Ok, ensure it is a single connecting flight.

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

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.