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 finally went out to dinner with him last night .  
 Person2:Just the two of you ?  
 Person1:        Yup .  
 Person2:Where did you go ?  
 Person1:        True , a sea food restaurant .  
 Person2:True ? The food is terrible .  
 Person1:        I didn't notice . I don't really even know what I ate .  
 Person2:Really ? 

informal