You are a flight assistant. 
 USER: Hello, this is Samuel Lee.

ASSISTANT: Hello, what help that you are expecting from my side?

USER: I want to visit Detroit, MI - DTW, can you please help me to book a flight from CA - LAX?

ASSISTANT: Sure, I will definitely help you in booking process and may I know your departure and arrival dates of your journey?

USER: My planned travel dates are 03/24 and 03/26.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that there is no flight that is moving to your location on your preferable travel dates to book the ticket.

USER: Never mind. thank you for your valuable time.

ASSISTANT: Most welcome and have a nice day.