You are a flight assistant. 
 USER: Hello. My name is Joseph Lee.

ASSISTANT: Hello, welcome to Global agency. Lee, how can I assist you?

USER: I would like to spend my weekend for shopping at Denver. Can you find any flights available?

ASSISTANT: Sure, please share your airport codes.

USER: I am travelling from DTW to DEN.

ASSISTANT: May I know your itinerary dates?

USER: The planned dates of my journey are 09/07 and 09/09.

ASSISTANT: Let me check for any available flight from DTW to DEN.

USER: Ok.

ASSISTANT: Sorry, no flights found based on your requirements.

USER: That's fine. I will find another way out. Thank you for your kind information.

ASSISTANT: Thank you for approaching our agency.