If I lose my passport when I was in Japan.

If I lose my passport, I have no idea what thing I can do. But I will go to Japan this month for a business traveling. Too shame. I am a adult, already 30 years old. So I will make a phone call to cried card company. I think cried company know how to fix this trouble. Before I call customer serive staff, I wried one thing again. The thing is if I lose my wattle when I was in Japan what can I do. We go to a foreign country, we do not know what something will happen. We should find a good way and prepare everything. We also need to protect ourself. Never talk to someone you do not know. Then we can have a good travel.