You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Ronald Phillips here. I'm planning to visit Oakland, can you please help me in booking the ticket from AUS to OAK?

ASSISTANT: Sure, I am here to help you out with that. Can you please share your travel dates to proceed further?

USER: Sure, I would like depart from my location on Feb, 19 and I want to return back by Feb, 21.

ASSISTANT: Do you have any airline preference?

USER: No, I don't have any airline preferences but I prefer business class ticket. Search for the flights accordingly.

ASSISTANT: Sure, please give me a moment to check for the flight availability.

USER: Fine, take your time.

ASSISTANT: Sorry to inform you that, there are no flights in business class as per your travelling details.

USER: Fine, may I know in which class the tickets are available?

ASSISTANT: As per your travelling details we have a flight in economy class. Do you want me to book that flight?

USER: Fine, please do not proceed for booking. Thank you for your time anyways.

ASSISTANT: Ok, thank you for consulting our agency.