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:       Does Mr . Schmidt know he's going to become a father ?  
 Person2:No , and I have no way of getting ahold of him ! There's no phone where he's at !  
 Person1:        Well , he has a surprise waiting for him when he gets back , doesn't he !  
 Person2:My older sister Judy will be here soon to help . She already has a boy and a girl of her own ...  
 Person1:        I just saw a red van pulling into the driveway . Is that her ? 

formal