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:       Mom ! ? ? ?  
 Person2:I know , sweetie . Just open wide . Don't talk .  
 Person1:        Mmm ...  
 Person2:Oh , you've got a fever . One-oh-one ... time to break out the children's Tylenol .  
 Person1:        I have the chills . Can you turn on the heater ?  
 Person2:We're not turning on the heater in May ! You need to take a bath . We'll heat you up and see if you can sweat this thing out . 

formal