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:       I'll participate in a quiz about the 29th Olympic Games in Beijing . It will be held tonight . Will you come ? 
 Person2:Sure . What do you know about the Olympic Games on the past ? For example , do you know where and when the first Olympic Games were held in the ancient times ? 
 Person1:        It was held in 776 B . C . at Olympia . It also has a long history of more than 2700 years . 
 Person2:Haven't the Olympics been stopped for a long time ? 
 Person1:        Yes , there were no games in 1916 , 1940 and 1944 , because of World War I and World War II . 
 Person2:I see . Look , do you know what that emblem means ? I've seen it so many times , but I don't know what it stands for . 
 Person1:        Oh , it's the Beijing 2008 Olympics ' Emblem . It's a Chinese seal , meaning that Chinese people warmly welcome the friends from all over the world . 
 Person2:I see . I believe there will be lots of foreigners coming to Beijing to watch the Games . 
 Person1:        Sure . 

formal