You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I aid you today?

USER: Please book a ticket to Chicago, IL-ORD from Detroit, MI-DTW.

ASSISTANT: Sure, I will book a ticket, may I know your travelling dates?

USER: Travelling dates are from 10/30 to 11/01.

ASSISTANT: Could you please help me with your halt conditions?

USER: I need direct flight.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: Thank you.

ASSISTANT: Thank you for picking us.