" What situations might lead you to say "I trust you're having a good day

Trust     در این جمله مسخره بنظر میاد ، میشه منظور را فهمید ولی عادی نیست 

بجای  Trust   میتونی     I believe        ,    I see   ,       I feel         استفاده کنی

“I trust you’re having a good day” would be slightly more normal, where you are saying that you expect that the person is having a good day. Even more normal is “I trust you’re having a good day?” (with question mark), which is a way of asking how their day is, but with an indicated expectation that they are having a good day.

if just you wanna find out the situations that make someone to say that state , think that you have a one of your friends go and buy a good motorbike , you know that friend is professional in subject, so you can completely trust in , 

that means that if you have trusted , because you know the trusted person in anyway,