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The utilization of a composite service has been substantially increased due to the wide usage of web services in various fields. However, composing existing web services automatically and dynamically according to user's request is a difficult task. But this can be achieved by adding the semantics to a service which can be done with the help of ontologies. In order to effectively utilize a composite service, the users require a convenient user friendly interface to invoke services which is natural language interface. But there are some issues like ambiguity of natural language expressions, handling negative sentences in user request. The proposed work aims to parse the user request and the extracted keywords are mapped to the ontology. Based on the IO concept in ontology the services are selected and are to be matched using Service matching algorithm and then matched services are to be composed.