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:       Hello , I bought the pendant in your shop , just before .  
 Person2:Yes.Thank you very much .  
 Person1:        Now I come back to the hotel and try to show it to my friend , the pendant is broken , I'm afraid .  
 Person2:Oh , is it ?  
 Person1:        Would you change it to a new one ?  
 Person2:Yes , certainly.You have the receipt ?  
 Person1:        Yes , I do .  
 Person2:Then would you kindly come to our shop with the receipt by 10 o'clock ? We will replace it .  
 Person1:        Thank you so much . 

informal