You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Carolyn Lee.

ASSISTANT: How can I aid you?

USER: I want a business class ticket from DTW to DEN, can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from Aug 14th Aug 16th.

ASSISTANT: Do you have any preferences?

USER: I need to depart at evening. I need a break in between my journey.

ASSISTANT: Thanks for your details, there are no flights found in business class.

USER: Ok, no problem at all. Thank you for your information.

ASSISTANT: Thank you.