You are a flight assistant. 
 USER: Hello, I am Brenda Wilson.

ASSISTANT: Hello, we are glad to serve you.

USER: I want to travel Detroit, MI-DTW to Seattle, WA-SEA on a family vacation. Can you please book a ticket for me?

ASSISTANT: Sure, can I have your travelling dates?

USER: OK, My travelling dates are from 09/25 to 09/27.

ASSISTANT: OK, please hold on, let me check and get back to you. Thanks for being patient, sorry, unfortunately no flight has found.

USER: OK, Thanks for the information.

ASSISTANT: You are welcome, thanks for your interest.