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:       Lousy weather , isn't it ?  
 Person2:It has stopped snowing , but it's even colder .  
 Person1:        Look at the ice there hanging from the eaves .  
 Person2:And the streets are covered with snow .  
 Person1:        Do you know what the temperature is today ?  
 Person2:I missed today's weather forecast over the TV .  
 Person1:        It feels like ten degrees below zero at least . I don't mind the cold weather but I do hate it when it gets slippery .  
 Person2:The ice will soon be thick enough for skating . I am so fond of winter sports .  
 Person1:        That's great . Let's go skating together tomorrow . 

informal