You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you right now?

USER: I am Sharon Wilson, want to travel from ORD to DTW. Please help me.

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are from 10/15 to 10/17. Please check for direct flight.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: It's ok. thank you.