Correction of an enquiry letter

[Ellena]

I'm a newcomer here actually, I've heard this is a great site to seek for help in teaching English. Well, I'm checking a business letter by one of my students now. The overall impression is favourable, but I have a few questions:

"We are a leading producer of beverages and we are looking for a company that suggests ("offers" is better, right?) events to make our staff teams more effective.
We saw your brochure and such cooperative activities as hill walking, canoeing, bridge-building are suitable for us.
We require a two-day event for 30 people, in groups of 8-10. All training should be done (is "finished" better here?) until the end of September.
Could you please send us a proposal describing the programme and costing (is it a good word to use in this case?) of all events. We would be grateful if you send a reply by 28 April."

Thanks in advance!

[Gillnetter]

I'm a newcomer here actually, I've heard this is a great site to seek for help in teaching English. Well, I'm checking a business letter by one of my students now. The overall impression is favourable, but I have a few questions:

"We are a leading producer of beverages and we are looking for a company that suggests ("offers" is better, right?) events to make our staff teams more effective. Yes - offers is better.
We saw your brochure and such cooperative activities as hill walking, canoeing and bridge-building are suitable for us.
We require a two-day event for 30 people, in groups of 8-10. All training should be done (is "finished" better here?) until (done of finished - change "until" to "by".) the end of September.
Could you please send us a proposal describing the programme and costing (is it a good word to use in this case?) (Use either "price" or "cost".) of all events. We would be grateful if yousend a reply by 28 April."
Your sentence is fine, but I would be a bit more formal - "We would be grateful if you would send us a reply by no later than April 28th."
Thanks in advance!

Gil

[Ellena]

You are a treasure, Gil! Thanks a million!