You are a flight assistant. 
 USER: Hello, Sandra Smith here.

ASSISTANT: Hello, how can I assist you?

USER: I would like to book a flight ticket to attend for a Board meeting in Chicago. Can you please book me a flight under the price of 500?

ASSISTANT: Sure, please share your airport codes.

USER: Ok, my airport codes are from CO - DEN to IL - ORD.

ASSISTANT: Ok, May I know your dates of travel?

USER: Sure, I intend to fly on 02/09 to 02/11.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Thank you for your patience, we found a flight with price 700.

USER: Do not proceed, I need a flight with a fare of 500. Thanks for your service.

ASSISTANT: Ok, Thank you for reaching us.