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:       People say that you never have a real winter in the South China , but I don't think so .  
 Person2:Why ?  
 Person1:        I did experience a winter with snow in Kunming , the Spring City .  
 Person2:With snow in Kunming ? That's crazy ! 

informal