thanks for your response.
We are trying to map with an ontology the human behaviour in a conversational engine enjoyed by a bot.
The relation that we imagine is between an user and a conversational node. The conversational-node is abstracted from concrete conversational-node and an user can enjoy the same node more times during the time.
So the interaction relation can exists more times. Now we can try to implement your suggestion finding if the relation already exists or not and if it exists adding a date resource.
Do you think that is right or maybe exists an alternative?