You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Patrick Walker. Can you please help me to book a ticket to Detroit within the price 200?

ASSISTANT: Sure, I will help you with that. May I know the travelling dates?

USER: I need a stopover in my journey. My travelling dates are 04/14 and 04/16.

ASSISTANT: Kindly mention your airport abbreviates?

USER: The airport codes are BOS and DTW.

ASSISTANT: Wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. We are sorry to notify you that we did not find any flights with your needs.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us, Have a great day.