You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Dennis Harris. I want to book a flight ticket from FL - MCO to MI - DTW, can you please help me in flight booking?

ASSISTANT: May I know your desired travel dates please?

USER: I want to fly on 07/26, return on 07/28.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.