You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a business class flight ticket to meet my friend at Austin, can you avail me a flight ticket?

ASSISTANT: Sure, please share me your source point?

USER: My source point is LAS.

ASSISTANT: Please mention when you planned to travel Austin?

USER: I will fly on Oct 21 and return on Oct 23.

ASSISTANT: Do you prefer a connecting flight or direct flight?

USER: Yes, I need a connecting flight.

ASSISTANT: May I know your good name?

USER: I am Angela Nelson.

ASSISTANT: Thank you for details, sorry there is no business class seat is available in any flight which travel on your given journey route.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for visiting us, we hope see you again.