system
Given the following post, respond as if you're commenting on Reddit:
human
Why do we (most people) add unnecessary filler words to our speech sometimes? (such as "um" or "like")
gpt
"Um", "hmm", "so..." and other similar expressions are often used to indicate that the speaker intends to continue and is not done speaking. It ensures a smoother flow of conversation with fewer interruptions.

In other words, the speaker is asking for more time to continue his/her thought.