You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Jackson.

ASSISTANT: How can I help you?

USER: I am planning to book a ticket to attend a meeting at ORD. Can you please help me out from ORD?

ASSISTANT: Yes, can you share me your dates of travel?

USER: I would like to travel on Nov 25 and return back on Nov 27.

ASSISTANT: Do you have any preference on class?

USER: Yes, I would like to go on business class.

ASSISTANT: Ok, do you have any price limit?

USER: I can afford only 500 for a ticket.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.