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:       Do you know the highest mountain in the world ?  
 Person2:Yes . It is Everest , also called Zhumulangma in China . It is 8,844 . 43 meters above the sea level .  
 Person1:        Wow ! That must be really awesome to stand on the top of the mountain to overlook the earth .  
 Person2:Actually , it is impossible because the mountain is covered with snow all year around . And is has heavy fog for most of the time .  
 Person1:        Have people set foot on its peak ?  
 Person2:Yes , it has been conquered by many people in history . 

informal