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:       Isn't this lovely weather ? Will you help me water the flowers , Jack ? 
 Person2:Well , do you think I have to ? 
 Person1:        I do.We haven't watered them for quite a few days . 
 Person2:Please look at the sky.Don ' t you see the dark clouds ? It's going to rain soon . 
 Person1:        Good.So we don't have to work.How nice ! 
 Person2:But I don't think it's so nice . 
 Person1:        Why ? 
 Person2:The weather report says it's going to rain for a whole week . 
 Person1:        Oh , I'm afraid all the flowers will die in the rain . 

informal