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 Bill , I saw your grandma yesterday .  
 Person2:Oh where was that ?  
 Person1:        I was running around the track at my college and there she was walking around the same track .  
 Person2:Grannie always tries to stay fit and healthy . She is always making us kids eat the proper foods .  
 Person1:        Well , it pays off for her . How old is she anyway ?  
 Person2:She will be 86 next month .  
 Person1:        That is truly amazing ! 

informal