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:       Chris , where are you going ?  
 Person2:I'm going to the store .  
 Person1:        Really ? I need to go to the store too .  
 Person2:Would you like to come with me ?  
 Person1:        Yeah , let's go together .  
 Person2:Would you like to go now or later ?  
 Person1:        Now .  
 Person2:What ?  
 Person1:        Now would be better .  
 Person2:OK , let's go .  
 Person1:        Should we walk ?  
 Person2:No , it's too far . Let's drive . 

formal