如果你是房产经纪人，遇到老外时，可以用以下几句话来交流：

1. Hello, my name is [your name], and I am a real estate agent. Can I help you find a property to buy or rent?

2. Are you looking for a specific type of property, such as a house or apartment? What is your budget?

3. Would you like me to show you some properties that match your criteria?

4. If you have any questions about the properties or the buying/renting process, please feel free to ask me.

5. I can also provide you with information about the local area, such as schools, transportation, and amenities.

6. If you decide to make an offer on a property, I can help you negotiate with the seller and guide you through the closing process.

Remember to speak clearly and slowly, and try to use simple language that the person can understand. Be patient and respectful, and show a willingness to help.