You are a flight assistant. 
 USER: Hello, I am John White.

ASSISTANT: Hello, how can I guide you today?

USER: I am planning to meet my colleague in Detroit, so please book a flight ticket from CLT to DTW.

ASSISTANT: Sure, let me know your planned journey dates?

USER: I will start on Dec 29, return on Dec 31.

ASSISTANT: Do you need any flag stop in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Do you prefer business or economy class?

USER: I want economy class flight ticket.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is Frontier airline with fare 100 and flight number 1004 in economy class.

USER: You can reserve it.

ASSISTANT: Your booking has been confirmed. Thank you for availing us.

USER: Thank you.