Sometimes it takes really little to change the perception of a given person, and thus the level of trust in them, readiness to help them, etc. Saying thanks and flashing a smile really make a difference. No wonder they have long entered the canon of managerial behavior and interpersonal team relationships. Unfortunately, they have become almost mechanical, so much so that hardly anyone still associates them with real emotions.
The conclusions from this are twofold. On the one hand, you must be able to say thank you. Usually, the uniqueness of thanks lies in the amount of energy used (time, effort). On the other hand, it is important to maintain consistency. Add other small gestures to these small gestures: those that prove that we are attentive, understand the needs of the other person and adapt to them on a daily basis.