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:       May I be of any help ? 
 Person2:Yes . Show me the sweaters , please . 
 Person1:        What style ? 
 Person2:Well , could you bring me all the styles of pullovers ? I am not quite sure which one I will buy . 
 Person1:        Ok . Here are the ones , turtleneck pullover , crewneck pullover , V-neck pullover and cowl-neck pullover . 

formal