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:       It's snowing outside .  
 Person2:Oh , how could it be ?  
 Person1:        Let's go out and have a look .  
 Person2:OK . Wait a minute .  
 Person1:        Look at the snow , it's so beautiful .  
 Person2:Yes . It's really snowing .  
 Person1:        I love winter , I love snow .  
 Person2:But don't you think it's a little too cold ?  
 Person1:        But I like cold more than hot .  
 Person2:You are so interesting . 

informal