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:       Good day to you . How can I be of service today ?  
 Person2:Hello . I'd like to open a Foreign Currency Account .  
 Person1:        I see . Well , this bank offers many different accounts of this nature . There are 7 to choose from  
 Person2:Oh dear . I wanted AUD . Is that not possible ?  
 Person1:        Well , you could change your Australian dollars into , say British pounds and then open an account . How does that sound ?  
 Person2:Maybe I'll go for the US dollar account . 

formal