You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to reserve ticket from DTW to LGA, can you help me in doing that?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are Oct 16 to 18.

ASSISTANT: Do you have any other requirements?

USER: I prefer business class.

ASSISTANT: Can I know your name?

USER: Amy Hill here.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: My pleasure.