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 are you ?  
 Person2:Fine .  
 Person1:        I haven ’ t seen you for several days .  
 Person2:Oh , I have been with my uncle for a week .  
 Person1:        What ’ s he doing ?  
 Person2:He is an accountant . I have been helping him for a week .  
 Person1:        He must be happy .  
 Person2:Yeah . How are you these days ?  
 Person1:        Fine too . 

formal