Why can't there only be one language? Or a universal Language

Write a conversation in chinese between two people. have the first person greet the second person, and tell their name. then, have the second person greets the first and tell their name. after that, have each person ask the other what time it is, what day of the week it is, and what month it is. have each person answer the other. in the end, have both people say goodbye to each other