You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Jonathan Wright. I have to attend an interview in QA software solutions at Chicago, can you please help me to book a flight ticket from EWR to ORD?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, my journey dates are Dec 26 and Dec 28.

ASSISTANT: Do you have any preferences?

USER: I would like to return in the evening time.

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

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

ASSISTANT: You are welcome, have a nice day.