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:       It's very kind of you to show me around .  
 Person2:Not at all . What would you like to see first ?  
 Person1:        I really don't know .  
 Person2:Let's walk around the lake first , shall we ?  
 Person1:        Yes , that would be lovely .  
 Person2:Have you been here before ?  
 Person1:        No , it's the first time I've been here .  
 Person2:I will take you to Li River after walking around here .  
 Person1:        That's wonderful ! I have heard the scene of Li River is beautiful !  
 Person2:Yes , you'll be in a different world there . 

informal