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:       Fred , have you made the plan for April 28th ?  
 Person2:Yes , sir . Shall I explain the details of the plan now ?  
 Person1:        You go !  
 Person2:According to your schedule , you will visit the Times Company , including its office building , workshops and stores , in the morning from 8: 30 to 11  
 Person1:        Is there anything after the meeting ? In that case , would you add one plan ? I want to visit our guest Mr . Ross after the meeting . Can you arrange it for me ? 

formal