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:       Union Bank . How can I be of service ? 
 Person2:I need to know how much money is in my account . 
 Person1:        I'll need your name and account number . 
 Person2:Certainly . 

formal