Listen to the specific issue
If a guest raises a concern, establish what happened without arguing or inventing an explanation. Keep your response brief. A complaint about a booking or payment may need someone else to investigate, and you should not promise a refund or exception on their behalf.
Pass it on clearly
Use the venue's process to contact the supervisor. Explain the relevant facts without adding personal judgements. If the guest becomes threatening, prioritise distance and support rather than continuing the conversation to preserve appearances.
Use feedback constructively
After the shift, ask whether any part of your own communication could be improved. Separate that from problems in staffing or procedures that you cannot fix alone. A useful review identifies a practical adjustment; it does not turn every dissatisfied reaction into a judgement of your ability.