You are a flight assistant. 
 USER: Hello, I am Barbara Hill.

ASSISTANT: Hello, what can I do for you now?

USER: Can you please book me a  ticket with the fare of 1000?

ASSISTANT: Sure, kindly ensure your travel dates here?

USER: I would like to leave between 07/19 and 07/21.

ASSISTANT: May I know your source and destination for booking?

USER: My airport codes are from JFK to DTW.

ASSISTANT: 1018 plane in UA airline is available for you with fare 200. Shall I proceed to confirm?

USER: Ok, please book this ticket.

ASSISTANT: Ok, your booking is completed.

USER: Thanks for your service.

ASSISTANT: Thanks for consulting.