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:       ok , so what have you got in store for me tonight ?  
 Person2:I'm really sorry , Ethan . I tried so hard , but I'm afraid I could't find a Dutch restaurant in town . The best I could do was a German one about 15 minutes from here .  
 Person1:        what ? I don't understand .  
 Person2:I though you said you wanted to have Dutch food ?  
 Person1:        Oh ! Ha-ha ! That's not what I mean when I said ' go Dutch ' !  
 Person2:Huh ? What were you talking about , then ?  
 Person1:        ' going Dutch ' means to split the bill , silly !  
 Person2:oath ... that makes so much more sense ! Ha-ha . Well , great , I don't like German food anyway ! 

informal