You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a flight ticket from Detroit DTW to Houston HOU. Can you find a flight ticket for me?

ASSISTANT: Sure, can you share your journey dates?

USER: Ok, my planned trip dates are on Nov 19 and return on Nov 21.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a single connecting flight.

ASSISTANT: May I know your name?

USER: Ok, my name is Melissa Smith.

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

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.