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:       Hello . Is Becky there , please ? 
 Person2:Just a moment , please . I ’ ll see if she ’ s free . 
 Person1:        Thanks . 
 Person2:Sorry , Becky can ’ t come to the phone right now . 
 Person1:        That ’ s okay . I ’ ll call back later . 

informal