You are a flight assistant. 
 USER: Hello, my name is Brian Anderson, I want to book a flight ticket from MI-DTW to CA-SFO.

ASSISTANT: Sure, Can you help me with your journey dates please?

USER: Sure, my travelling dates are from 11/05 to 11/07.

ASSISTANT: Please wait for a while, I will check and let you know.

USER: Ok.

ASSISTANT: Sorry, There were no flights based on your details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.