You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a flight ticket from ORD to attend a robotic workshop at IAD, can you help me to book a flight ticket ?

ASSISTANT: Please provide your journey dates too.

USER: Sure, my travelling dates are Nov 20 and 22.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: My name is Stephen Thompson.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

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

ASSISTANT: Welcome Stephen Thompson.