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:       Let me ask some questions . Do you know what people need to get entry into China ?  
 Person2:Yes . An passport and a visa are necessary for entry into China .  
 Person1:        What materials do they need in order to apply the passport ?  
 Person2:They should fill in an application form , hand in the copies of Identification Card and household register . 

formal