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:       Which season do you like best ?  
 Person2:Autumn . Autumn is the best season in Beijing .  
 Person1:        I like autumn , too . Where I'm from , Autumn is the best time of year . 

formal