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:       Is this Mr David Richton ? 
 Person2:Yes . 
 Person1:        Hello , Mr David Richton , this is Min Wang calling from network , i am calling about the reporter position you advertised on the internet . 
 Person2:Oh , yes , Mr Wang , i look at your resume you emailed , very impressive , are you a P . M . ~ meet someone like you , i was thinking of calling you this afternoon , and having a telephone interview . 
 Person1:        That is wonderful . 

informal