You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you help me to reserve a flight ticket from DFW to DTW?

ASSISTANT: Sure, can you share your trip dates?

USER: My depart is on 28 Sep and return on 30 Sep.

ASSISTANT: Do you have any preferences?

USER: I would like to return in the evening with a connecting flight.

ASSISTANT: May I know your name?

USER: I am Scott Robinson.

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

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.