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:       Hey , Zina . You're here early today .  
 Person2:Yeah , I'm going to be making phone calls all day . What a blast .  
 Person1:        I just wanted to say thanks for putting us on the map so fast . I appreciate it .  
 Person2:Save it , Vince . After I put my first million in the bank , I'll say you're welcome .  
 Person1:        Fair enough.Keep up the good work . 

informal