1. CLARIFYING AN ENQUIRY
Subject: A question about [production]
Hi [name],
To prepare a useful proposal for [production], could you confirm [specific missing detail]?
Once we have that, we can [next step you can actually commit to].
Thanks,
[Name]

2. FOLLOWING UP A QUOTE
Subject: [Production reference] — quote [number / version]
Hi [name],
Have you had a chance to review the proposal for [production]?
Does the scope match what you need, or is there anything you would like us to clarify before you decide?
Thanks,
[Name]

3. WAITING FOR CLIENT ASSETS
Subject: [Production reference] — assets for [next stage]
Hi [name],
We are ready for [next stage] once we receive [specific assets].
Are you able to share them by [agreed date], or should we discuss the production plan?
Thanks,
[Name]