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:       Are you still hungry , Ryan ? How about some more squid balls ?  
 Person2:Squid balls ? How about some more fruit !  
 Person1:        Wow ! You really like fruit , huh ? You've already had 3 plates !  
 Person2:Yeah , it's funny . I usually don't ever eat fruit ...  
 Person1:        Well , whatever suits your fancy . I'll press the service button again . 

informal