A method, a computer system, and a computer program product are provided. A computing system receives natural language first textual input from a second computing system and performs natural language processing. The natural language processing identifies vagueness and missing information in the first textual input. Additional information is obtained from at least one source responsive to identifying at least one of the vagueness and the missing information. The identified vagueness and the missing information are resolved based on the obtained additional information and a meaning of the first textual input is determined. Output is provided to the second computing system for presentation to a user.