Latam's cancellation policy allows passengers to cancel their flights under certain conditions. If you need to cancel a flight, you can do so by contacting their customer service at their toll-free number, +1-804-[853]-9001
Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement.
No serious private advertisers ask for a down payment before you meet.
Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.