You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you  today?

USER: I am planning to attend a Tennis Competition in Houston HOU from DTW. Can you find a flight ticket for me?

ASSISTANT: Sure, please share me your trip dates.

USER: Ok, my planned trip dates are on May 28 and return May 30.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Yes, I am Christopher Roberts.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a direct flight to travel.

ASSISTANT: May I know your class preferences?

USER: No, I need a single connecting flight. I want to depart in the afternoon time.

ASSISTANT: Please share me your airline specifications.

USER: No, I don't have any airline specifications.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

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

ASSISTANT: Thank you for opting us.