You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Donald Taylor, want to travel from DTW to DEN. Can you please help me?

ASSISTANT: Sure, please share me your travel dates.

USER: My trip dates are from 09/24 to 09/26.

ASSISTANT: Do you need any specifications?

USER: Yes, I want business class.

ASSISTANT: Please hold for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's fine, thank you.

ASSISTANT: Thank you for opting us.