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:       The weather in Beijing is just beautiful !  
 Person2:Autumn is the best season in Beijing , you know .  
 Person1:        Yes , I can see . The summer heat is over , and the winter cold is still far away .  
 Person2:What is the weather like in Washington at this time of this year ?  
 Person1:        Autumn is also very nice in Washington .  
 Person2:Is it very cold in winter there ?  
 Person1:        No , it isn't . But sometimes it snows a lot in winter .  
 Person2:Does it rain a lot in summer there ?  
 Person1:        Oh yes ! Sometimes it rains very heavily.How about here in Beijing ?  
 Person2:There's a lot of rain in summer , but it seldom rains in autumn .  
 Person1:        I feel it's rather dry here .  
 Person2:That's true . Many people from the south don't like the weather here .  
 Person1:        Are you from the south ?  
 Person2:No , I'm from the north . I was born in Beijing , actually .  
 Person1:        I see.so this is your hometown ? 

informal