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 are your parents these days ?  
 Person2:Oh , they're fine , still very active and enjoying their retirement .  
 Person1:        Oh , good . That's nice to hear . Please give my best regards to them when you're home .  
 Person2:Sure , thank you . 

informal