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:       It's quite cold this early morning , isn't it ?  
 Person2:Yeah . It's already December , you know .  
 Person1:        Time sure flies , doesn't it ? 

formal