Edit the following sentence to make it more concise: We regret to inform you that we are unable to accept your proposal.
"We regret to inform you that your proposal was not accepted."
Complete the following task based on the instruction and optional input provided.### Instruction:
Edit the following sentence to make it more concise: We regret to inform you that we are unable to accept your proposal.

### Output:
"We regret to inform you that your proposal was not accepted."