You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Glad to meet you.

USER: I am Jonathan Scott.

ASSISTANT: How may I assist you for today Scott?

USER: I would like  to visit Cloud Gate in Chicago which was built by Indian born British artist Anish Kapoor. Will you please book a flight ticket from IAD to ORD?

ASSISTANT: Really, nice.Yes, sure I will help you for booking a flight ticket. Can you provide your dates of journey?

USER: Sure, my preferred dates are 02/11 and 02/13.

ASSISTANT: I am really sorry, Scott there is no flight which can reach your destination.

USER: Oh! That's sad to me. Anyway, thank you for your information.

ASSISTANT: Thank you so much for reaching our service.

USER: Most welcome.

ASSISTANT: When ever you want to book a flight ticket please visit us again.

USER: Sure, I will try.

ASSISTANT: Thank you.