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:       What a lovely day , isn't it ?  
 Person2:Yes , it's nice and bright .  
 Person1:        I hope it stays like this .  
 Person2:I hope so too .  
 Person1:        Is the weather usually like this here ?  
 Person2:It's usually a bit hotter than today .  
 Person1:        What's the weather like in winter ?  
 Person2:It's pretty cold and it often snows .  
 Person1:        I wonder what it ’ s going to be like tomorrow .  
 Person2:Let's hear the weather report later . What's the weather like in your hometown ?  
 Person1:        Neither too cold , nor too hot .  
 Person2:That's quite a lovely weather .  
 Person1:        Yes , especially in spring .  
 Person2:Have you ever seen a hurricane ?  
 Person1:        Once , when I was a child .  
 Person2:Do they often happen in your country ?  
 Person1:        Now and then .  
 Person2:Oh , it's time for the weather reporter . Let's turn on the TV . 

informal