Given the task definition and input, reply with output. 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'.

Person1: Front desk , can I help you ?
Person2:Yes , I need a wake-up call tomorrow at seven thirty .
Person1: Sure . Your room number , PLS ?
Person2:Room 1019 .
Person1: Room 1019 , tomorrow at seven thirty . Ok , we will give you a call in the morning .
formal