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:       I'm calling to ask about your apartment you advertised .  
 Person2:Yes , we've got great apartments with charming environment and nice scenery.And they are all newly renovated .  
 Person1:        That sounds fantastic ! But I am looking for something closer to downtown , as I spend most of my time at the office .  
 Person2:No problem . We have a nice apartment located near the Oriental Square . It's perfect for people busy with office work . It is fully furnished with a service staff taking care of the trivial details .  
 Person1:        I'm sure they are wonderful , but I need an unfurnished apartment with relatively lower cost .  
 Person2:Ah ! I get your point . We have just what you need . Our Jinyuan apartments have several floor plans . The one bedroom apartments are very economical , but their layout makes great use of a small amount of space . I think you can find a very apartment there .  
 Person1:        Great ! I'll arrange a viewing after work tomorrow afternoon . Could you tell me the detailed dress ?  
 Person2:Of course . It's just at 19 Lingual Road . You can phone me again if you can't find the right place .  
 Person1:        OK . Thank you . 

informal