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:       I can ’ t decide what to do today .  
 Person2:Well . Let ’ s go swimming .  
 Person1:        Don ’ t you think it ’ s a bit cold for that ?  
 Person2:Then why don ’ t we go for a walk in the hills . It ’ d be very good for us you know . 

informal