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 whether 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 whether 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 slows a lot in winter . 
 Person2:Does it rain a lot in summer there ? 
 Person1:        Oh . Yes . Sometimes it rains very heavily 
 Person2:How about here in Beijing ? 
 Person1:        There ’ s a lot of rain in summer . But it seldom rains in autumn 
 Person2:I feel it ’ s rather dry here 
 Person1:        That ’ s true . many people from the south don ’ t like the whether here . 
 Person2:Are you from south ? 
 Person1:        No . I ’ m from the north . I was born in Beijing actually . 
 Person2:I see . So this is your hometown ? 

formal