You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want book a direct flight from SFO to DTW. Can you find a flight ticket for me?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Ok, my journey dates are on Oct 31 and return on Nov 02.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok, but I want a direct flight.

ASSISTANT: May I know your name please?

USER: Yes, I am Eric Martinez.

ASSISTANT: Sorry Eric Martinez, there are no flights available on your requested dates.

USER: That's fine, no problem. Thank you for your information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.