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:       What are your working hours ?  
 Person2:Eight to twelve in the morning , two to six in the afternoon .  
 Person1:        Much better than mine .  
 Person2:What are your hours ?  
 Person1:        Mine aren't fixed . Sometimes I do the day shift , sometimes the night shift . 

formal