You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a flight ticket from DTW to ORD?

ASSISTANT: Can you please share your trip dates?

USER: I am planning to travel in the month of Dec from 19th to 21st.

ASSISTANT: Do you prefer connection limit?

USER: I want to travel in direct flight.

ASSISTANT: May I know your specifications?

USER: I prefer business class seats.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: No flights found on your route.

USER: That's ok, thank you for checking.

ASSISTANT: May I know your name?

USER: Catherine Lewis here.

ASSISTANT: Thank you.