Describe what you can see
Give the location, whether the water is continuing to appear, and any accessible connection nearby. Do not open walls just to gather information for a phone call.
Explain when it happens
Does moisture appear when a fixture runs, or is it present all the time? Has nearby plumbing been repaired before? Those details help explain the concern.
Make contact directly
Call for an active leak and ask about current availability. A website request alone does not confirm a response time or appointment.