just attend the tea making trials. Manager then will ask you the availability, and did you find it easy to make the drink. it is a simple interview. No need to worry about it.

Self-introduction in 30 seconds (optional), check for availability would prefer as many as possible to show ur determination work in the shop. Then is the trial shift. During the trial shift you have to demonstrate ur communication, and problem-solving , resilience abilities, and common sense.