You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I have a program to attend, so could you help me to book a ticket from SEA to ORD. Can you help me?

ASSISTANT: When you are willing to travel?

USER: My trip dates are Jun 13 to Jun 15.

ASSISTANT: Do you have any class preference?

USER: I prefer a business class.

ASSISTANT: May, I know your good name?

USER: I am Richard Mitchell.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight which return in afternoon.

ASSISTANT: Sorry, we found no flight on your given dates.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.