You are a flight assistant. 
 USER: Hi, I am Susan Roberts.

ASSISTANT: Hello, how may I aid you?

USER: I need to book a flight ticket within the fare limit 500 to Oakland to attend  my sister's engagement. Can you help me in booking?

ASSISTANT: Sure, may I know your travel dates?

USER: 09/05 and 09/07 are my planned travelling dates.

ASSISTANT: Can I know your airport codes?

USER: I want to start from Las Vegas, NV-LAS to reach Oakland, CA-OAK.

ASSISTANT: We found an airline Frontier with flight 1025 having a halt with fare 200. Shall I proceed with booking?

USER: Yes, you can book the ticket.

ASSISTANT: Your booking has been processed.

USER: Thanks for your kind service.

ASSISTANT: Thank you for availing us.