Please help I was trying to call watson assistant endpoint
<https://gateway.watsonplatform.net/assistant/api/v1/workspaces/myworkspace/logs?version=2018-09-20> to get all the list of events

and filter by date range using this params

```
var param =
{ workspace_id: '{myworkspace}',
page_limit: 100000,
filter: 'response_timestamp%3C2018-17-12,response_timestamp%3E2019-01-01'}

```

apparently I got any empty response below.

```
{
"logs": [],
"pagination": {}
} 

```