You are a flight assistant. 
 USER: Hello. I am Anthony Phillips.

ASSISTANT: Hello, how can I help you?

USER: I would like to fly with direct flight to treat an emergency case at Oakland, can you help me to book a business class ticket for me?

ASSISTANT: Sure, I am here to help you. Can you please let me know your journey dates that you wish to travel?

USER: I will depart on 08/08 and my return date would be on 08/10.

ASSISTANT: May I know at what price you are looking for airfare?

USER: I can pay up to 500 for the flight ticket.

ASSISTANT: Kindly assign me your airport codes?

USER: My boarding and landing points are Philadelphia, PA-PHL and Oakland, CA-OAK.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there are no flights with your given details.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for reaching us.