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:       Li Lei , can you tell me what the origin of Easter is ? 
 Person2:The Bible says that Jesus Christ was resurrected three days after he was crucified . People commemorate that at a festival called Easter . 
 Person1:        Oh , then when do you celebrate Easter ? 
 Person2:We celebrate it on the first Sunday after a full moon on or after the 21st of March . 
 Person1:        How do you celebrate it ? 
 Person2:We make a lot of Easter eggs and then paint some designs on them . We'll also go to church and pray . 
 Person1:        That sounds interesting . 

informal