Use case 2: Onboarding journey

We want to improve our customer's experience by informing them of their upcoming flight. Two weeks before their flight we want to remind them they have a booked flight and use this opportunity to upsell our customers with a personalized offer. When it's time to check in to their flight, we want to send our customers an email or push notifying them they can now check in.The journey should also take into account last-minute bookers and not send both messages if you book a flight for the same day.