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 rather cold . Isn ’ t it 
 Person2:Oh . Yes . It is 
 Person1:        Shall I light the stove ? 
 Person2:That ’ s a good idea 
 Person1:        Well . What ’ s the climate like in your country ? 
 Person2:It ’ s mild . but it ’ s not always pleasant . 
 Person1:        Which season do you like best ? 
 Person2:I like spring . The days are long and the nights are short . The flowers in blew . We go on picnics 

formal