You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephanie Collins.

ASSISTANT: How may I help you?

USER: Can you please help me with flight ticket booking?

ASSISTANT: Sure, tell me your travel dates please?

USER: I want to take off on Mar 31 and I will catch the return flight on Apr 2nd.

ASSISTANT: Now share your airport codes please?

USER: My regional airport codes are IAH to DTW locations.

ASSISTANT: May I know your departure and return time please?

USER: I need a flight which will return back from DTW in evening time.

ASSISTANT: Do you have any other preferences?

USER: I need a single stop off flight.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry there no flights available in the evening time.

USER: So sad to hear that one, I can prefer any other source to reach my destination. Thank you for your help.

ASSISTANT: Thank you.