What did you do when you see sick passenger collapse on board when you were a cabin crew?

When I witnessed a passenger collapse on board, I immediately prioritized their safety by ensuring the area was clear and calling for assistance from the other crew members. I checked the passenger's responsiveness and vital signs, while another crew member alerted the pilot and prepared for potential medical intervention. We provided first aid as needed and kept the passenger calm until we could arrange for medical assistance upon landing. Throughout the situation, I communicated with the passengers to reassure them and maintain order.