Final answer:
To respond to a guest approaching the building, greet them warmly and offer assistance if appropriate, ensuring you make a good first impression and act responsibly.
Step-by-step explanation:
When you see a guest approaching the building, it is important to offer a polite and helpful response. Begin by greeting the guest warmly to make a good first impression. Depending on the context, if it's part of your job, you may also offer to guide them through the building or assist them with their visit. In a more general sense, always be attentive to the needs of others.
For instance, if you witness someone in distress or a potentially dangerous situation, such as a suspicious person approaching, it is your responsibility to take action. This could involve intervening directly if it's safe to do so, or alerting an adult, authority figure, or the appropriate emergency services.