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:       What a brilliant smile !  
 Person2:That's my cousin Hubert . He likes smiling .  
 Person1:        He must be very easy-going .  
 Person2:Sure , he's ready to be friendly with anyone . 

informal