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 a surprise meeting you here , Landy .  
 Person2:I ’ m here as a tourist .  
 Person1:        It ’ s a small world , isn ’ t it ?  
 Person2:Yes , it ’ s a small world . We never know where we ’ ll meet someone we know . 

informal