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:       Do you think the weather will be good this weekend ?  
 Person2:I heard it might rain .  
 Person1:        Oh . That ’ s a pity . I thought that we might go hiking in the hills .  
 Person2:Mmm ... Well we could go to that new art gallery instead .  
 Person1:        Yes that might be a better idea .  
 Person2:Maybe we ’ ll meet some of the artists too .  
 Person1:        Ok - let ’ s do that then ! 

informal