You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to attend a Seminar in Detroit. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am mirthful to help you in booking. Can you please share your travel dates?

USER: My travelling dates are May 25 and May 27.

ASSISTANT: Let me know your connection limit.

USER: I need a nonstop flight. I want to prefer normal cost airline.

ASSISTANT: Please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My airport codes are DEN and DTW.

ASSISTANT: Can you please tell me your name?

USER: I am Patrick Lewis.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us, have a nice day.