You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Please book my ticket from OAK to MCO.

ASSISTANT: Sure, can I know your trip dates please?

USER: My trip dates are Aug 18 and Aug 20.

ASSISTANT: Do you have any other requirements?

USER: I prefer business class.

ASSISTANT: Can I know your name please?

USER: Linda Collins here.

ASSISTANT: Please wait.

USER: I need a connecting flight.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: No problem, thank you.

ASSISTANT: Most welcome.