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 . Are you a friend of Helen's ?  
 Person2:Actually , a friend of a friend .  
 Person1:        My name is Phil . What's yours ?  
 Person2:Alecia .  
 Person1:        Have you tried these little ditties ? They are really good .  
 Person2:Thanks . They look delicious .  
 Person1:        Can I get you some punch ? I was just going to go get myself some .  
 Person2:That would be great . I would love some . 

informal