You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Jason Robinson. I am planning to visit Dallas DFW from New York EWR. Can you find a flight ticket for me?

ASSISTANT: Sure, can you share your journey dates?

USER: My itinerary dates are on Feb 20 and return on Feb 22.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a business class.

ASSISTANT: Sorry, there is no business class available to book a ticket.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.