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 a lovely day out today , isn't it ?  
 Person2:It's beautiful . Enjoy it while it lasts . It's supposed to get cold tomorrow .  
 Person1:        What's the weather forecast for tomorrow ?  
 Person2:It's supposed to snow early tomorrow morning and then tomorrow afternoon there's a chance of freezing rain .  
 Person1:        That doesn't sound pretty .  
 Person2:Do you have any plans for tomorrow ?  
 Person1:        Well , I was going to drive to Birmingham to see some friends .  
 Person2:You might want to change your plans . With the cold and wet weather that we're supposed to have tomorrow , the roads are going to be rather slippery .  
 Person1:        I suppose I should . I don't like driving in dangerous weather conditions . Do you have any plans for tomorrow ?  
 Person2:I just have to go to class tomorrow afternoon .  
 Person1:        If you're lucky , it'll get cancelled and you can have a snow day !  
 Person2:If that happens , then I'll invite you over and we can drink hot cocoa and watch movies .  
 Person1:        That sounds like fun .  
 Person2:Hey , look outside ! It's started to drizzle !  
 Person1:        English weather is even more predictable than I had previously thought . 

informal