No sooner said than done
Definition 1 of 1
Pro Tip 1/3Immediate Response
Use this phrase when an action is done instantly after being spoken about, without delay. 
As soon as I mentioned how cold I was, she offered her jacket—no sooner said than done.
Pro Tip 2/3Efficient Service
Perfect for describing situations where service or assistance is provided quickly and efficiently. 
When I asked for the bill at the restaurant, it came no sooner said than done.
Pro Tip 3/3Idiomatic Usage
Remember, this phrase is an idiom so its meaning isn't literal, but figurative to express quick action. 
He offered to fix my bike, and no sooner said than done, he had it up and running again.