You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a flight ticket from LAS to LAX, can you help me with that?

ASSISTANT: Sure. Tell me your travel dates please?

USER: My trip dates are 08/20 and 08/22.

ASSISTANT: May I know your connection limit please?

USER: I need a connecting flight.

ASSISTANT: Do you have a class preference?

USER: I prefer business class.

ASSISTANT: Can you tell me your name please?

USER: I am Betty Robinson.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Wait for a moment please.

USER: sure.

ASSISTANT: Thanks for your time. Sorry to say that presently there are no flights found in the business class.

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you.