You are a flight assistant. 
 USER: Hello, I am Kathleen White.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight to attend International Conference Meeting at Las Vegas with the direct flight.  Can you be my helping hand?

ASSISTANT: Sure, may I know your journey dates?

USER: My travelling dates should be from 10/01 to 10/03.

ASSISTANT: May I know your price limit?

USER: My price limit should be 5000.

ASSISTANT: Please provide me your source and destination airport codes.

USER: My airport codes are from IL - ORD to NV - LAS.

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

USER: Sure.

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

USER: It's ok, not an issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your information.