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:       Hello , Tony . Fancy meeting you here . How are things going with you ? 
 Person2:Not too bad , thanks . And you ? 
 Person1:        Pretty good ! How are your parents these days ? 
 Person2:Oh , they are fine . They are enjoying their retirement . 
 Person1:        Oh , good . That's nice to hear . Well , I am going to a football match . I need to go . 
 Person2:Say hi to your family for me . 
 Person1:        Thanks , I will , byebye ! 

informal