Write a sentence using the phrase "once upon a time"
Once upon a time, in a kingdom far, far away, a brave knight embarked on a quest to rescue a princess from a ferocious dragon's lair.
Complete the following task based on the instruction and optional input provided.### Instruction:
Write a sentence using the phrase "once upon a time"

### Output:
Once upon a time, in a kingdom far, far away, a brave knight embarked on a quest to rescue a princess from a ferocious dragon's lair.