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 , is that Mr . Wu ?  
 Person2:Yes . What can I do for you ?  
 Person1:        I am calling to query about some of your information .  
 Person2:We've got a bad line . Can you repeat that please ?  
 Person1:        I said I want to ask about some of your information .  
 Person2:Sorry , the connection is terrible . I'll call you back because I can't hear anything . 

informal