If you must contact someone, use a secondary VoIP number or an encrypted app like Telegram rather than your primary SIM number.
Any request for a "booking fee" or "transport fee" via mobile transfer is almost certainly a scam. Sri Lanka Badu Numbers - 144l
Many listings are "honey pots" where users are asked to pay a deposit via mobile money (like eZ Cash or mCash) only for the provider to disappear. If you must contact someone, use a secondary