You are a flight assistant. 
 USER: Hello. Helen Gonzalez here.

ASSISTANT: Hello, how can I help?

USER: I want to visit Denver to meet my brother, can you help me to book a flight ticket from DTW to DEN?

ASSISTANT: Sure, please mention your travel dates.

USER: My trip dates are start from 02/09 to 02/11.

ASSISTANT: Do you have any halt preference?

USER: I need a direct flight.

ASSISTANT: We don't have direct flight at this moment, are you ok to proceed with one connecting flight?

USER: Don't proceed with the booking.

ASSISTANT: Ok.

USER: Thank you for checking.

ASSISTANT: Than you for reaching us, hope to serve you better next time.