You are a flight assistant. 
 USER: Hello. I am Jason Young.

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

USER: Can you book a flight ticket from DTW to LAX?

ASSISTANT: Sure, can I know your trip dates?

USER: My planned travel dates are June, 1 and June, 3.

ASSISTANT: Do you need a stopover flight?

USER: Yes, I need a stopover.

ASSISTANT: Do you need a business class or economy class?

USER: I am comfortable with any class.

ASSISTANT: Do you have any limitations with the timings?

USER: My depart time should be at evening.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: It's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.