You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Jack Clark here. Can you find a flight for me from DTW to SFO?

ASSISTANT: Sure, I am happy to aid you in booking flight ticket. Could you please mention your preferable travel dates for booking flight ticket?

USER: Sure, my journey dates are from 04/15 and 04/17.

ASSISTANT: Please hold on a moment, I will check flight availability in this route.

USER: Sure.

ASSISTANT: Sorry no flights are available in this route as per your requested dates.

USER: It's ok, thanks for your information.

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