You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am planning to meet my friend in Los Angela, LAX. Could you please help me with booking a flight ticket from LAS?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My planned travel dates are Oct 18 and Oct 20.

ASSISTANT: Do you have any class preference?

USER: I always prefer business class.

ASSISTANT: There is a direct flight available with Hawaiian airline, shall I proceed? Sorry.

USER: Yes, please proceed with that booking.

ASSISTANT: There is no business class ticket available.

USER: Thank you very much in reserving my ticket. Ok.

ASSISTANT: May I know your name?

USER: Sure, my name is Edwards Martinez.

ASSISTANT: Thank you for reaching us.