An automated method for converting a source model Mantext file compatible with a legacy document composition tool to a target markup language file dialogue exchange format compatible with a communication management platform, wherein each source model Mantext file section stored in a mainframe is converted to a corresponding target markup language file dialogue exchange format and stored on a server, the method characterized by the steps of: a) exporting the source model Mantext file from the mainframe to the server; b) extracting one or more control instructions from the source model Mantext file automatically; c) extracting variable from the one or more control instructions of the source model Mantext file and substituting the extracted variable of the control instructions of the source model Mantext file with the equivalent variable of the target markup language file dialogue exchange format based on one or more attributes of the extracted variable; d) extracting rule from the one or more control instructions from the source model Mantext file automatically and substituting the extracted rule of the control instructions of the source model Mantext file with the equivalent rule of the target markup language file dialogue exchange format based on one or more attributes of the extracted rule; e) extracting paragraph from the one or more control instructions of the source model Mantext file and substituting the extracted paragraph of the control instructions of the source model Mantext file with the equivalent paragraph of the target markup language file dialogue exchange format based on the rule present in the extracted paragraph; f) substituting the control instructions of the source model Mantext file with an equivalent control instruction of the target markup language file dialogue exchange format based a one or more attributes of the control instructions of the source model Mantext file; and g) importing the substituted variables, rules, paragraphs and the control instructions in the communication management platform in a single stretch. a) exporting the source model Mantext file from the mainframe to the server; b) extracting one or more control instructions from the source model Mantext file automatically; c) extracting variable from the one or more control instructions of the source model Mantext file and substituting the extracted variable of the control instructions of the source model Mantext file with the equivalent variable of the target markup language file dialogue exchange format based on one or more attributes of the extracted variable; d) extracting rule from the one or more control instructions from the source model Mantext file automatically and substituting the extracted rule of the control instructions of the source model Mantext file with the equivalent rule of the target markup language file dialogue exchange format based on one or more attributes of the extracted rule; e) extracting paragraph from the one or more control instructions of the source model Mantext file and substituting the extracted paragraph of the control instructions of the source model Mantext file with the equivalent paragraph of the target markup language file dialogue exchange format based on the rule present in the extracted paragraph; f) substituting the control instructions of the source model Mantext file with an equivalent control instruction of the target markup language file dialogue exchange format based a one or more attributes of the control instructions of the source model Mantext file; and g) importing the substituted variables, rules, paragraphs and the control instructions in the communication management platform in a single stretch.