Showing your appreciation
Besides 'thank you', what else can you say? Learn the following expressions, which are arranged in the degree of formality.
I know you'd do the same for me. (Between close friends)
Anytime! (very informal)
Don't mention it.
No problem.
That's all right!
Pleasure! / It's my pleasure!
You're welcome!
Glad to have helped.
The pleasure was all mine.
It was the least I could do. (formal; British)