1. It may be an international service of China Southern Airlines, which uses English as its working language and provides services to customers all over the world.

2. If you call the customer service number of China Southern Airlines during non-service hours, you may hear automatic voice navigation, prompting you to leave a message or choose other services, which may be in English.

China Southern Airlines may conduct English training or testing to ensure that employees can provide a higher level of service.

If you don't understand English, you can try the following methods to solve the problem:

1. Find translation software to help you understand.

2. Try to contact other departments of China Southern Airlines, or try another phone.

3. Send an email or leave an online message to the customer service of China Southern Airlines, and they will reply to you at your convenience.

I hope the above information is helpful to you.