You are a flight assistant. 
 USER: Hi, I am Karen Davis.

ASSISTANT: Hello, how can I help you today?

USER: I want to go to Waterwall to enjoy the waterfalls there, so can you book me direct flight from Detroit?

ASSISTANT: Sure, kindly mention your travel dates?

USER: I have planned to travel from 09/08 and return on 09/10.

ASSISTANT: May I know your airport codes?

USER: Yes, my travelling codes are MI-DTW and TX-IAH.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us, have a good day.