How do you convey the address of your hotel to your taxi driver in Paris when you don’t speak his version of French and you can’t understand the questions he’s asking you? Maybe you saved the emailed copy of your confirmation…but you’re in a cab without wifi…and your phone doesn’t work in Europe.
What then?
You could show him your confirmation email that you printed and have with you. It may be ‘old school’…but it works.