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 , it is a pleasant surprise !  
 Person2:Yeah , it ’ s been ages ! So how have you been ?  
 Person1:        Couldn ’ t be better . And you ?  
 Person2:Just as usual , you know . 

informal