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First, Try to offer some drinks. Offer a cold water. Avoid serving Coffee or hot Tea.
Next, You have to listen.
Let an irate customer vent out his complaints. Never disrupt them. Jot down notes of his complaints. Listen to him very carefully. Then, after he is done about his complaints, Thank him for his reaction. let him know you are prioritizing his concerns and will take action on it. Finally, offer a solution. whether its a short term or long term solution.