Date: 04/08/2019 Time: 1800 Location:JFK airport. Terminal 4. Gate B44. Flight number DL5421; from JFK to Cleveland While boarding, I gave the ticket to desk agent to be scanned. While doing so, I laid my phone on the desk as i had bags in my hand. I Boarded the plane and forgot my cellphone on the agent's desk. As soon as the plane took off, I noticed that i forgot my phone back on the desk. I informed the flight attendant of whom i dont recall the name. She made a call to the desk and confirmed to me that the phone is there with the agent. She told me to head to delta office at Cleveland airport to get further info on how to proceed. At Cleveland airport, the agent there also made phone calls and confirmed that the phone is found. She told me to call Delta baggage at [protected] and also to call UPS to set up a prepaid shipping account and send a label for them to deliver the item. After purchasing the label, i called the delta baggage number for them to tell me that they do not have the phone with them. I activated the "find my iphone" and found that the phone is still at jfk airport. Despite that, they told me that they dont have the phone and suggested that i make a claim. I did make the online claim with no result. I have no other explanation than my phone was either stolen by the desk agent or the person who was supposed to take it to the delta luggage. I would appreciate if an investigation would be done. Thank you Boulos El Hachem [protected]@gmail.com [protected] Phone description: Black iPhone XR. Black case with word "spigen" engraved at the left lower side. Photo of a baby on the screen.