My usual canned opening line is ‘Hi I’m X and I’m enquiring about your Y?’ Or just ‘Hi, I’m after some Information/advice about Y’

So basically that greets them and gives them an opening to ask what they can help you with, allowing you to go into more detail and explain the problem.

I wouldn’t say I was great with people or the phone but I sometimes do have to cold call or email a lot of organisations.