You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I planned to attend for a seminar in IAD, can you please help me to book a flight ticket from ORD?

ASSISTANT: Sure, can you share your trip dates?

USER: I prefer to travel on Feb 3 and Feb 5.

ASSISTANT: Do you have any preferences?

USER: I prefer to travel in business class.

ASSISTANT: May I know your name?

USER: I am Virginia Walker.

ASSISTANT: Sorry, there is no flight on your given preferences.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.