You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

USER: I want to book a ticket from JFK to DTW. Could you book a ticket?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Depart is Feb, 5 and return date is Feb, 7.

ASSISTANT: Do you have any other specifications?

USER: I prefer economy class.

ASSISTANT: Please help me with your name for booking.

USER: My name is Jason Perez.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Thanks.

ASSISTANT: Thank you for choosing us.