You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in booking from OAK to CLT, as there is a musical concert?

ASSISTANT: Sure, can I know your travelling dates?

USER: My trip dates are Jul 18-20.

ASSISTANT: Do you need a single connecting flight?

USER: I am looking for a stopover flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer a business class.

ASSISTANT: May I know your name?

USER: I am Margaret Lopez.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.