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:       How ’ s your father ?  
 Person2:He ’ s fine . He retired last week . It ’ s turning point in his life . Now he can relax and enjoy his retirement .  
 Person1:        He can spend more time with his grandchildren .  
 Person2:Oh , I don ’ t think he wants to . He wants to travel to several different countries around the world .  
 Person1:        So , he wants to have a more active retirement . Good idea !  
 Person2:How do you want to spend your old age ?  
 Person1:        In the same way , probably . 

informal