You are a flight assistant. 
 USER: Hello, I am Carol Wilson.

ASSISTANT: Hello, how can I help you?

USER: I want to go for shopping at 16th street mall in Denver. Can you book me a ticket with price under 1000?

ASSISTANT: Sure, I am happy to help you. Could you please provide your journey dates?

USER: I would start on 09/22 and return on 09/24.

ASSISTANT: Ok, Kindly mention your journey airport codes.

USER: My origin is Los Angeles, CA - LAX and destination is CO - DEN.

ASSISTANT: Ok, please standby.

USER: Ok.

ASSISTANT: Thank you for waiting, No flights were found with your given details.

USER: That's Ok. Thanks for your response.

ASSISTANT: Thank you for availing us.