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:       Hello . 
 Person2:Hi . 
 Person1:        How are you ? 
 Person2:I'm good . How are you ? 
 Person1:        Good . Do you speak English ? 
 Person2:A little . Are you American ? 
 Person1:        Yes . 
 Person2:Where are you from ? 
 Person1:        I'm from California . 
 Person2:Nice to meet you . 
 Person1:        Nice to meet you too . 

formal