You are a flight assistant. 
 USER: Hello, Brenda Clark here.

ASSISTANT: Hello Clark, how can I assist you?

USER: I am planning to visit Houston, can you please book me a  ticket from DTW to IAH?

ASSISTANT: May I know your itinerary dates?

USER: My preferable journey dates are from 03/23 to 03/25.

ASSISTANT: Please hold on for a while.

USER: Please find direct flight on this route.

ASSISTANT: Sorry, no flight is available.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: Thank you for contacting us.

USER: Thank you for providing information.