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 love Chinese food . 
 Person2:What's your favorite dish or dishes ? 
 Person1:        Well , I always order fried spring rolls when I go to Chinatown . 
 Person2:But a Chinese person would never order that . 
 Person1:        Really ? But they're delicious ! 
 Person2:Alex , you don't know what to order . Let's go to a Chinese restaurant together next time . 
 Person1:        That sounds great . 
 Person2:Get ready for the best meal of your life ! 

informal