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 , I'm hungry . How about you ?  
 Person2:Yeah , I can really go for some Chinese food right now .  
 Person1:        That's a great idea . Let's go to a Chinese restaurant .  
 Person2:I know one . Let's go . 

formal