You are a flight assistant. 
 USER: Hi, Katherine Mitchell here.

ASSISTANT: Hello, Katherine. What can I do for you today?

USER: I want to visit Land of OZ at Charlotte to watch its beauty. Can you please book a ticket with a halt?

ASSISTANT: Sure, we can book flight ticket. When are you willing to travel?

USER: I have to start on 10/15 and return on 10/17.

ASSISTANT: OK, can you share me your affordable budget for this trip?

USER: I can afford 5000.

ASSISTANT: Please help me with your take off and landing airport codes.

USER: My origin is PHL and destination is CLT.

ASSISTANT: Ok, wait a while I will revert to you.

USER: Sure.

ASSISTANT: We are happy to say you that we find a cheapest flight for you from Delta airline with flight number 1017. Shall I proceed with the booking?

USER: It's perfect. Please proceed.

ASSISTANT: Katherine, your booking has been confirmed and it costs you 100.

USER: Thanks for your service.

ASSISTANT: Thank you for picking us.