A cooperative and polite language is required to achieve the goal of conversation, either to deliver an idea or express feelings. In spite of that, the rule of cooperative principle proposed by Paul Grice is different from the rule of politeness principle proposed by Geoffrey Leech. Therefore, this study aims to find out the application of both principles and the relation between the two of them in utterances. To conduct this study, an American movie titled Isn't It Romantic was chosen as the subject. The method used in this research was descriptive qualitative. The findings show that there are 53 data of the application of cooperative and politeness principles. Therefore, there is a correlation between the cooperative and politeness principles in the conversations of this movie. The result of this study is expected to be a guideline to create an ideal conversation in society.