Need help : Is it possible to cancel(or reschedule at different time) orchestration when in Pending state?

We have a scheduler using DTF, **CreateScheduledOrchestrationInstanceAsync(Type orchestrationType, string instanceId, object input, DateTime startAt)** is used to schedule orchestration. The issue is that once orchestration is scheduled and in Pending state, is it possible to override scheduled time. Have tried to use CreateScheduledOrchestrationInstanceAsync again with different time and same instanceid but then orchestration is getting executed at both the times (old and new/updated)

any idea on how to fix this?