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:       Post office offer lots of services nowadays , don ’ t they ? Years age , you only really used the post office to send mail , save money , and send or collect money .  
 Person2:Nowadays , they offer so many services , you hardly know which one to choose . Take mailing for example . Do you send something first class or second class or do you use EMS ?  
 Person1:        I save money in a post office saving account . There used to be just one kind of account , but now there are several . They each have different conditions and interest rates .  
 Person2:You can buy things at post office that were never sold there before . You can buy sweets and chocolates , newspapers , birthday and Christmas cards ...  
 Person1:        Post offices are still the place to go to collect welfare benefits , like unemployment benefit and child support benefit . The queue are very long on the days when people collect those payment .  
 Person2:My son likes going to the main post office . They have a philately counter where he can buy stamps for his collection .  
 Person1:        Do you think that the service at post offices has improved ?  
 Person2:I think it ’ s better for some things , like sending and receiving money , but if you need to post something it sometimes takes longer than it used to .  
 Person1:        I like being able to buy newspapers and magazines at the post office . It means that I don ’ t need to go to two places 

formal