You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Myself Kenneth Lewis. I want to book a ticket from DTW to LAX, can you help me to book a flight?

ASSISTANT: May I know your trip dates?

USER: Sure. My preferable dates are 09/23 to 09/25.

ASSISTANT: Sorry, no flights are found on your given details.

USER: It's ok.

ASSISTANT: Thank you for approaching us.Have a nice day.

USER: Thank you.