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:       Hello , Helen .  
 Person2:Hi , Steven .  
 Person1:        How are you today ?  
 Person2:I ’ m very well , Thank you . And you ?  
 Person1:        I ’ m fine , thanks . How is Tony ?  
 Person2:He ’ s fine , Thanks . How ’ s Emma ?  
 Person1:        She ’ s very well , too , Helen . Goodbye , Helen . Nice to see you .  
 Person2:Nice to see you , too , Steven . Goodbye . 

informal