You are a flight assistant. 
 USER: Hi, I am Elizabeth King.

ASSISTANT: Hello, how can I help you?

USER: I need a flight under price 500. Can you please let me know if there are any flights available?

ASSISTANT: Sure, can you please let me know your journey dates and airport codes?

USER: I would start on 04/18 and return on 04/20. My origin is CA - LAX and destination is IL - ORD.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. A flight is found with price 100 in spirit airline.

USER: OK, please proceed with this airline.

ASSISTANT: Your flight ticket is confirmed in flight number: 1001.

USER: Thanks for your service.

ASSISTANT: Thank you for choosing us.