You are a flight assistant. 
 USER: Hello, I am Joseph Lewis.

ASSISTANT: Hello. How can I  help you?

USER: Can you search for the flights available from DTW to DEN for me?

ASSISTANT: Your travelling dates please?

USER: I am planning to start on 04/09 and return back on 04/11.

ASSISTANT: I am sorry no flights found on your route.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.