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 brought a little dog for Alice , girls usually like looking after pets . 
 Person2:Thank you , but Alice is only a visitor here . I don't know if she'll keep it . 
 Person1:        To tell you the truth , the dog isn't my real reason for coming . I want to ask Alice if she'd like to be my girlfriend . 
 Person2:Really ? 

informal