You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am planning to book a flight ticket to DTW from JFK, can you please help me out?

ASSISTANT: May I know on what dates would you like to travel?

USER: Sure, my planned travelling dates are June 12 and June 14.

ASSISTANT: Do you have any other requirements?

USER: Yes, I prefer economy class.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: It's ok, thank you for the information.

ASSISTANT: May I know your name?

USER: Sure, my name is Ryan Lopez.

ASSISTANT: Thank you.