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:       Is everything ready for the big family barbecue tomorrow ?  
 Person2:Yep . The steaks and chicken are marinated and I also bought hamburger buns .  
 Person1:        We should also cook a couple dozen hot dogs and kebabs .  
 Person2:Yeah , good idea.We can put some lawn furniture outside next to the grill . I also set up the tent outside so we can hide from the sun if it gets too hot .  
 Person1:        Great ! I asked Grace to bring cups and serviettes as she is also bringing two big coolers for the beers .  
 Person2:This is gonna be a great barbecue ! 

informal