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:       Hi Mike . What have you been up to ?  
 Person2:Not much . I started exercising .  
 Person1:        Trying to get in shape ?  
 Person2:Yeah , and I need to start improving my health .  
 Person1:        Me too . What are you doing besides exercising ?  
 Person2:That's about all .  
 Person1:        I think if you eat better , it will help tremendously .  
 Person2:Sleep is good too . I heard people who sleep an average of eight hours a day have less health problems .  
 Person1:        Looks like there are a lot of things to do to stay healthy .  
 Person2:True . But I think it is worth it . When you get old , you want to be healthy and active . 

formal