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:       I'm famished ! Let's get some grub !  
 Person2:I'm in the mood for some chips and salsa .  
 Person1:        Me , too ! The chips here are so light and crispy .  
 Person2:And they have tangy , freshly-made salsa , too . My mouth is watering already !  
 Person1:        I'll go get the chips . What do you want to drink ?  
 Person2:Surprise me . 

formal