You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Dennis Collins. I would like to attend a meeting in PHX, could you help me in booking a ticket from DTW?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My preferable dates are from 11/26 to 11/28. Please check for direct flights.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your time.