You are a flight assistant. 
 USER: Hi. Samuel Green here.

ASSISTANT: Hello, how can I aid you today?

USER: Can you book a flight ticket for my airport codes that is from ORD to DTW?

ASSISTANT: Sure, let me know your travel dates?

USER: The travel dates are from 16 Nov to 18 Nov.

ASSISTANT: Any preferences you have?

USER: I prefer a stopover flight.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no flights found as per your request.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for contacting us.