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:       Nice and warm again , isn ’ t it ?  
 Person2:Oh , it ’ s lovely . Think of the nasty weather we had last week .  
 Person1:        How are you these days ?  
 Person2:Fine , thank you . And you ?  
 Person1:        Fine today , though a bit under the weather last week . 

informal