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:       I am looking for some information about home stay .  
 Person2:Well , I have been in a host home before . During my first year in the us , I stayed with a family . They are nice .  
 Person1:        How did you pay them ?  
 Person2:Well , that depends . If you stay for a long time . They will offer a discount . 

formal