You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need to travel IAD and ORD, can you reserve flight ticket?

ASSISTANT: Sure, can you please share me your travelling dates?

USER: My travelling dates are Mar,19 and Mar,21.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer single connecting flight.

ASSISTANT: Is there any other specifications?

USER: I need business class flight ticket.

ASSISTANT: May I know your name?

USER: Myself Kenneth Phillips.

ASSISTANT: Sorry, there were no flights with your given details.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.