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:       Excuse me , Mr . Macmillan ?  
 Person2:Yes , Ms . Ross ? What do you need ?  
 Person1:        I was hoping you would write a letter of recommendation . I want to enter a Master ’ s program in marketing . It ’ s all on weekends and evenings .  
 Person2:Good news ! I ’ ll be glad to . When do you need it ? 

informal