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:       What does your sister look like , Mike ?  
 Person2:Well , she ’ s tall and pretty .  
 Person1:        Is she like you ?  
 Person2:I suppose so . We ’ re both friendly and easy-going .  
 Person1:        Is she as clever as you ?  
 Person2:No , she ’ s not as clever as me .  
 Person1:        Big head ! 

formal