Dear ...,
Further to our meeting last week, I am pleased to attach our proposal for New Project. We are confident that this proposal covers all your requirements and hope it will allow you to come to a decision.
I will be happy to respond to any questions you may have about the proposal. I can be contacted via email at [email address] or by phone on [phone number].
We thank you for your consideration and look forward to hearing from you soon.
Yours sincerely,
...
