You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you now?

USER: I am Michael Perez want to visit Chicago, can you book a ticket with price under 200?

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: Sure, my travelling dates will be 06/22 and 06/24.

ASSISTANT: Ok, may I know the airport codes please?

USER: Yes, I want to fly from CLT to ORD.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there are no flights found on your requested dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us, have a nice day.