You are a flight assistant. 
 USER: Hello. I am Patrick Smith.

ASSISTANT: Hello, How can I help you?

USER: I am planning to visit Houston, TX-HOU best locations to shoot movie. So can you please help me to book a flight ticket from Detroit, MI-DTW?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are from 09/14 to 09/16.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's not a problem. Thank you.

ASSISTANT: Thank you for opting us.