You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket with the name Nancy Jones, can you book me flight ticket with price under 200?

ASSISTANT: Sure, may I know your journey dates?

USER: As I want to see Cloud Gate at Chicago on 09/17 and return on 09/19.

ASSISTANT: Please provide me your source and destination.

USER: Source is from Atlanta, ATL and destination is to Chicago, ORD.

ASSISTANT: Please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thanks for choosing us.