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:       Beautiful weather , isn ’ t it ? 
 Person2:Yes , it is . Are you here on business ? 
 Person1:        No , I ’ m on a vacation to see the famous Three Gorges . 
 Person2:I ’ m going there for a tour , too . Is this your first trip to China ? 
 Person1:        Yes , it is . 
 Person2:Why don ’ t we go together ? I can show you around . I think you ’ ll have a better time . 
 Person1:        I couldn ’ t agree more . 
 Person2:Great , let ’ s go ! 

informal