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:       Then I must go-you have said it yourself .  
 Person2:No , you must stay ! I swear it , and the oath shall be kept .  
 Person1:        I tell you I must go !  
 Person2:Where ?  
 Person1:        I have spoken my mind , and can go anywhere now .  
 Person2:I ask you to pass through life at my side-to be my second self and best earthly companion .  
 Person1:        I'll never again come to your side ; I am turn away now and can't return . 

informal