Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       At the Beijing Olympics , all four table tennis events were all-Chinese finals . A clean sweep again !  
 Person2:Yes . All international ping-pong tournaments have become a demonstration of Chinese supremacy in the sport .  
 Person1:        Do you know any secrets to China's success ?  
 Person2:In the first place , I think the whole nation is just fond of the game . It is well grounded with the mass . With huge numbers of people playing ping-pong , we can always spot a handful of potential world champions .  
 Person1:        So , the national ping-pong team must be a highly competitive membership .  
 Person2:Sure . There is a careful mechanism for selecting players from provincial teams , and those lucky dogs have to observe strict rules .  
 Person1:        For example ?  
 Person2:They are subject to hard training . And you know what , for a player on the national team , personal affairs are supposed to take a back seat to training and competitions . They are not even allowed to talk relationships with each other .  
 Person1:        Oh , dear ! It's an encroachment on individual rights !  
 Person2:Well , ping-pong is our national sport , and we just have to keep winning one honor after another . That's why many people think such rules acceptable . After all , they are funded out of taxpayers'money . 

formal