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 think it's going to be a nice day .  
 Person2:It's certainly a big improvement over yesterday .  
 Person1:        But it'supposed to get cloudy and windy again this afternoon .  
 Person2:Well , the worst of the winter should be over . 

informal