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:       Bob is getting on in years .  
 Person2:Yeah , I'm very worried about his health .  
 Person1:        He looks tired all the time .  
 Person2:He's working too hard . 

informal