It's nearly there. What you need is simply a little punctuation and a few word changes to make it clear.
Your message (corrections):
"Dear,
hope this email finds you well, (Capitalise the H, as it is the start of a sentence. This sentence is fine, assuming what you mean is that you hope the recipient is well. Let me know if that isn't the case. Also, end the sentence with a full stop/period)
Reference to your last email, kindly find Chairs offer as per your request. (This is mostly okay, but it would be better to say 'In regards to your last email', or 'with reference to your last email', or 'with respect to your last email'. In fact, many people would simply write 'RE: your last email'. Just be clear with what you are trying to say with in regards to 'find chairs offer as per your request'. I think you are saying you have made an offer to buy some chairs, and the receiver has asked you to name a price? In which case you can say 'please find my offer stated below, as per your request'.)
Regarding your question if we can remove one disk from the order unfortunately the order has been set and we can’t change it." (Good, instead of 'if' here try something like 'Regarding your question about changing the order...' The rest of the sentence is essentially fine, although instead of 'set' you might want to use 'finalised' or even 'dispatched' if you have actually sent the order).
Hope this helps; let me know if you need any of the corrections explaining further.