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've come to apologize for what I said yesterday .  
 Person2:Don ’ t think any more about it .  
 Person1:        I must make an apology for losing my temper .  
 Person2:It ’ s really not necessary . I know your intention was good .  
 Person1:        I ’ m relieved to hear that . Anyway , it ’ s my fault . 

informal