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:       Whoa , look at all those ice cream choices !  
 Person2:Yes , that is a lot of choices . What is your favorite ?  
 Person1:        I love anything with chocolate the best .  
 Person2:I like chocolate myself .  
 Person1:        Is there any kind of ice cream you don't like ?  
 Person2:I really don't like any ice cream with nuts in it .  
 Person1:        I haven't ever cared for that myself .  
 Person2:Have you ever had garlic ice cream ?  
 Person1:        That sounds absolutely disgusting !  
 Person2:It was . Let's stick with the regular choices today , though . 

informal