You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you book a flight ticket in my preferable travel dates Nov, 11 and Nov, 13?

ASSISTANT: Yes, can you tell me your nearest airport codes?

USER: LAX and AUS are my nearest airport codes.

ASSISTANT: Do you have any other specifications?

USER: I need direct flight with business class.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Can I know your name for documentation?

USER: My name is Katherine Taylor.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.