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 nice and bright today , isn't it ? 
 Person2:Yeah.The autumn is marvelous here . 
 Person1:        How about winter ? 
 Person2:That's a hard time.The air is cold and damp , and the road is often icy . 
 Person1:        It's boring , right ? 
 Person2:Sure . 
 Person1:        Do you get much rain during the summer ? 
 Person2:Plenty.We never worry about lack of rainwater in our area . 
 Person1:        So you should bring an umbrella often . 
 Person2:That's right . 

informal