You are a flight assistant. 
 USER: Hello, I am Karen Gonzalez.

ASSISTANT: Hi,. How may I help you?

USER: Can you book me a direct flight for a round trip from Detroit, MI - DTW?

ASSISTANT: Sure. May I know your travelling dates?

USER: I want to start on 03/05 and come back on 03/07.

ASSISTANT: Do you have any other specifications?

USER: No, please find me a flight with these particulars.

ASSISTANT: OK,wait a minute.

USER: Ok.

ASSISTANT: Sorry! Karen, we did not find any flight matching your specifications.

USER: Its Ok.

ASSISTANT: Thank you for contacting with us. Have a nice day.

USER: Thanks for your assistance.