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:       Excuse me . May I ask you some questions ?  
 Person2:Sure . What do you want to know ?  
 Person1:        Could you please tell me how many credits would be required for a bachelor's degree ?  
 Person2:Well , you have to get 166 credits , including required courses and optional courses .  
 Person1:        OK . And how long does it take to get a bachelor's degree ?  
 Person2:It can be completed in four years normally .  
 Person1:        I see . Thank you very much .  
 Person2:You're welcome . 

informal