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:       Wow , Is winter always this cold in Taiwan ?  
 Person2:Not really . It's much warmer usually . Your are not used to cold weather ?  
 Person1:        No , I am from south California . This is my first real winter .  
 Person2:Well , You'd better get some more warm clothes .  
 Person1:        What's the temperature today anyway ?  
 Person2:I would say it's about 5 degree Celsius . 

formal