9. The method as claimed in claim 6 further comprising generating a barge-in level based on the travel context for adjusting an extent of stopping the prompt.
6. A method of operation of a content delivery system comprising: determining an utterance type of either receiving a command phase or setting up a trigger phase based on a travel context; receiving the command phrase based on the utterance type; determining a trigger match with a control unit based on the command phrase matching a trigger phrase representing a phrase for stopping a prompt; stopping the prompt according to a prompt type representing an interruptible prompt based on the trigger match; and continue playing the prompt representing the prompt type of an uninterruptible prompt even if the trigger phrase is detected for controlling the prompt presented by a device.