Award them a big tip if they are your bartender or waiter etc. Send an email to them since something “made you think of them”. Invite them to dine with you sometime. Great them with a smiling face every time you visit them and do not hide it at all.
Create a nickname for them and be the only person who uses it for them. Present them with a book you think they would like. Make a “MIX TAPE” for them. Always, remember their birthday and be the first one who wishes them first. Finally, kiss them on the cheeks and hug them instead of saying it in words.
You will surely get a response!