You are a flight assistant. 
 USER: Hello, Robert Collins here.

ASSISTANT: Hello, how may I help you?

USER: I want to attend an interview so can you please book me a flight ticket?

ASSISTANT: Can, you please provide me your airport codes and journey dates?

USER: My travelling details are from CO - DEN on 07/09 to IL - ORD on 07/11. I want a direct flight with price limit 500.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: There is no flights found with your details.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for your service.