It could be slightly challenging to speak about negative experiences that could cause you to feel angry and frustrated. Your employer should want to know how you can handle an unpleasant situation because since you are a receptionist you will always have to interact with those who regularly visit your company. So the best way to answer this question is by thinking of the times when you have actually been upset or mad at someone because of their behaviour. You should also explain what this situation is and how have you been able to handle it. You must also make the customer service philosophy and goal here. Be calm and positive too.