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:       How long have you been in Taiwan ?  
 Person2:About 3 years , so I came here 2000 .  
 Person1:        So , where did you grow up ?  
 Person2:Providence , Rhode Island . do you know it ?  
 Person1:        I am not sure , where exactly is it ?  
 Person2:Well , not so far from New York . So what about you ? Did you grow up here ?  
 Person1:        No , I was born in Gaoxiong , I only moved to Taipei after I graduated . 

formal