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:       Hello , Fife Computers . How can I help ? 
 Person2:Hello , this is the Corporate Department of Lincoln Bank calling . We are calling to let you know that some documents have arrived for you at our bank . 
 Person1:        Oh , really ? Do you know which company they are from ? 
 Person2:They're from Schnitt's of Rudesheim , Germany . Would you like us to check them ? 
 Person1:        What's the charge for that ? 
 Person2:It's 150 RIB for the service . 
 Person1:        That seems pretty reasonable . Thanks . 

informal