You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan King.

ASSISTANT: How may I help you?

USER: I want to book a ticket from CLT to ORD to attend seminar, can you help me in booking?

ASSISTANT: Ok, please help me with your travel dates.

USER: I am departing on Sep 06 and return on Sep 08.

ASSISTANT: May I know your class preferences?

USER: I am ok with any class.

ASSISTANT: Sorry to say, there is no active reservation found on your name.

USER: That's ok, thank you for your information.

ASSISTANT: There is no flight for you on your route. Welcome.