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:       So John , have you ever been to China before ?  
 Person2:No , I haven ’ t . This is the first time I have been to China .  
 Person1:        Have you travelled to many other countries ?  
 Person2:To be honest , I have never been to an Asian country before but I have visited many countries in Europe .  
 Person1:        What about America ? Have you ever been to the United States ?  
 Person2:Actually , I haven ’ t been to the states but I have been to Canada . 

formal