<human>: How can I tell if someone is having a heart attack?
<bot>: If you think someone may be having a heart attack, call 911 or your local emergency services immediately. You should also try to provide first aid and comfort until help arrives. Ask the person questions about their symptoms and any medical conditions they have, such as chest pain, shortness of breath, nausea, sweating, lightheadedness, and dizziness. Monitor them closely for changes in breathing, pulse, or other signs of an impending heart attack.