During the Qingming Festival, I made an appointment with my friends to go on a trip, but something happened and I missed the appointment. What should I do?

The apology should be sincere, and you must not lie or unintentionally spoil things. Most people think that a cold is not a serious matter and should not be used as an excuse, so you should explain more. If your mobile phone is broken, you need to repair it. It's even more of an excuse. How can you get your phone repaired when you have a serious cold? Can I repair my cell phone but still not be able to travel? So friends will obviously distrust your excuse.

It's best to show them the proof of a cold, intentionally or unintentionally, such as a diagnosis of a sling bottle or something.