You are a flight assistant. 
 USER: Hello, I am Ryan Clark.

ASSISTANT: Hello, how can I aid you?

USER: Can you please book me a flight ticket from MI - DTW to MN - MSP?

ASSISTANT: Sure, may. May I know your journey dates?

USER: My trip dates are from 12/09 to 12/11.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry Ryan, there is no flight available on your route.

USER: It's ok, not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.