At 7 o'clock in the evening, I knocked on the door and said that my air conditioner was leaking, so I came to repair it. I paused and didn't call for maintenance. How can I find you?

Remember not to open the door for him. If it is downstairs, the property manager will assist in handling it. As long as there is a property staff knocking at the door or calling in advance, you can open the door for him, otherwise try not to open the door! If people who often meet downstairs are acquaintances, they will open the door for them. Don't open the door for strangers or acquaintances of friends! It's night. Try to be vigilant! Just in case!