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:       Hi , Mr . Wang . Do you feel like going boating with me ?  
 Person2:Sounds interesting , I haven't gone boating for some time now , and what time ?  
 Person1:        How about tomorrow afternoon ?  
 Person2:Sure . Where shall I meet you ?  
 Person1:        At the gate of the park .  
 Person2:Great . I look forward to meeting you .  
 Person1:        See you then .  
 Person2:See you . 

informal