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 , Sandra . how was your weekend ?  
 Person2:Great ! I went hiking in the mountains on Saturday .  
 Person1:        Fantastic ! how was that ?  
 Person2:Really good ! you should try it sometime .  
 Person1:        I might . what did you do yesterday ?  
 Person2:Uh , nothing much , just went to bed early . I was still tired from Saturday . 

informal