This e-mail can be used for potential vendors or for vendors you've already hired for your wedding if it is taking weeks to get a response.
Hi (Vendor’s name),
Over the past several weeks of our communications there has been a significant delay in hearing back from you. Is this your normal response timeframe or are there extenuating circumstances causing the delay?
Choose the second portion based on whether they are a potential or already hired vendor
I am hesitant to move forwards with hiring you for our wedding due to the lack of timely communication, and would appreciate if you could let me know your usual timeframe for responses.
The lack of timely communications has made planning and sorting out details for our day challenging, I would appreciate more timely communication leading up to our wedding. When are you available to discuss the details of our day?