You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to visit Institute of Detroit with my students, can you help me with booking?

ASSISTANT: Sure, I will help you with that. May I know your preferable airport codes?

USER: My airport codes are LAX to DTW.

ASSISTANT: Can you please share your travelling dates?

USER: My travelling dates are Apr 26 and Apr 28.

ASSISTANT: May I know your name please?

USER: I am Eric Rodriguez.

ASSISTANT: Which class do you prefer either economy or business?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: Sorry to say that, there are no flights found on this route as per your travel dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.