Say thank you, be appreciative and don't forget to show your appreciation and gratitude.
HELPFUL HINT:
“Being appreciative is good for you. Being appreciative and expressing appreciation to others enhances feelings of well-being; it makes people feel connected to what they have and to their experiences. Expressing appreciation builds social bonds and, in fact, appreciation is significantly related to life satisfaction and positive feelings. More importantly, being appreciative is a disposition, it can be taught.”