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:       Good afternoon !  
 Person2:Hi , how are you doing ?  
 Person1:        Fine , thanks . I am Wang Lin .  
 Person2:Glad to meet you , Wang Lin . I am Mary .  
 Person1:        Is this your first time in Beijing ?  
 Person2:Yes . My company has an office here , and I have just been transferred .  
 Person1:        Here is my phone number . If you need anyone to show you around , call me .  
 Person2:Great . I would like that . 

informal