I booked a plane ticket for two people with my mobile phone. Why did I only send a text message to one person, but I was marked?

If you are two people in the same order, even if you fill in two mobile phone numbers in the contact, he will only send them to the first mobile phone, not to the alternative mobile phone. In fact, there is nothing wrong with this, as long as it is the person who places the order. This is no problem.