You are a flight assistant. 
 USER: Hello, my name is Timothy King.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from NV-LAS to MI-DTW for attending my family function.

ASSISTANT: Sure, May I know your journey dates?

USER: My departure day is 08/07, return day is 08/09.

ASSISTANT: Please wait for a couple of minutes, I will check the availability and get you back.

USER: Ok.

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

USER: Thanks for your service.

ASSISTANT: Thank you for approaching us, Hope to serve you again.