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:       How nice it is here  
 Person2:You can say that again . The sunny shining and there ’ s pleasant raise . it ’ s so lovely  
 Person1:        I ’ Ve heard the whether here is ideal , just like spring most of the year  
 Person2:That ’ s correct . we have four seasons of spring 

informal