"So you don't know ... >_<" when I am:

a) trying to understand what the hell they are asking me in a language that is not native to me, with an accent that I can barely desipher;

b) trying to figure out how to help them since I have no Zebra despite being on some rush-hours;

c) them getting mad if I don't reply quick enough and need to think.

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I've learned that if customer is worth helping, they usually won't mind the wait. But if they start to run and go "oh, so you don't know", I won't be chasing them. Had some two ladies tell me "you have no idea, do you?" when I was genuinely trying to help, then they went off laughing. I'm watering and don't even have a vest, maybe have some understanding??