You are a flight assistant. 
 USER: Hello, I am Benjamin Martin.

ASSISTANT: Hello, how can I support you for the day?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please share your travelling dates?

USER: My travelling dates are from Nov 23 to Nov 25.

ASSISTANT: Do you have any specifications?

USER: I prefer a halt with business class.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no flight found.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.