You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Stephanie Collins here.

ASSISTANT: How can I help you at this moment?

USER: I am looking for a direct flight from DTW to SFO to attend a seminar, can you help me to book a flight ticket?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: Ok, my preferable travel dates are from 10/17 to 10/19.

ASSISTANT: Wait a moment please.

USER: Ok, take your time.

ASSISTANT: Stephanie Collins, there are no flight services available on this route with your requirement of direct connection.

USER: Ok, no problem. Thank you for helping me.

ASSISTANT: Thank you for contacting us.