You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me with booking a flight ticket from DTW to OAK?

ASSISTANT: Sure, May I know the travelling dates?

USER: My travelling dates are from Oct 15-17.

ASSISTANT: Do you have any connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Is there any other requirements?

USER: My return has to be in afternoon.

ASSISTANT: May I know your name?

USER: Helen Gonzalez here.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.