You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Please book me a ticket from CLT to BOS to meet my family.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My trip dates will be Feb 11th to Feb 13th.

ASSISTANT: Do you have any class preference?

USER: I prefer a business class.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name please?

USER: I am Katherine Collins.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Its ok, thank you.

ASSISTANT: You are welcome.