You are a flight assistant. 
 USER: Hello, Christine Green here.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit Los Angeles, can you please book me a ticket from DTW to LAX?

ASSISTANT: Sure, may I know your journey dates please?

USER: My preferable journey dates are from 06/17 to 06/19.

ASSISTANT: Southwest airlines is having a flight with travel charge of 200, shall I proceed for booking?

USER: Please reserve my ticket with this flight.

ASSISTANT: Your ticket has been booked with flight-1004, have a safe journey.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for choosing us.