Assuming you're working at/for JP Morgan - which is the only way you'd qualify for their special rate - then you can simply request their corporate rate when making the booking. You'll need to be able to prove you're working for them and it's best to use your JP Morgan work email address. You'd also need to check with your HR team that it's ok to book a corporate rate (which is technically meant for business travel) for a personal holiday. Most companies don't care, but there's always someone that makes life awkward for everyone else!