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:       Belinda , I ’ m going to a party tonight . What shall I wear ?  
 Person2:Is it formal or informal ?  
 Person1:        I guess it ’ s formal .  
 Person2:Then , you should dress well .  
 Person1:        That ’ s right .  
 Person2:I think a white shirt with a blue tie looks nice on you .  
 Person1:        You are smart .  
 Person2:Of course , the sports shoes don ’ t go with the formal occasions .  
 Person1:        You are right . What kind of shoes should I wear ?  
 Person2:The brown leather shoes go well with your trousers .  
 Person1:        Good idea . Oh , by the way , would you please pick me up after the party , honey ?  
 Person2:It ’ ll be too late ; you ’ d better take a taxi .  
 Person1:        OK . 

informal