To make a reservation with Delta Airlines tickets, you can visit their official website or call their customer service number at 1-888-279-5001. If you have already made a reservation and need to make changes or check your itinerary, you can use your reservation number to access your booking on the Delta website or through their mobile app. Delta Airlines also offers a 24-hour risk-free cancellation policy, which allows you to cancel your reservation within 24 hours of booking and receive a full refund. Additionally, they offer flexible ticket options that allow you to change or cancel your itinerary with no change fees, depending on the type of ticket you purchase. If you have any specific questions or concerns about your Delta Airlines reservation, I recommend contacting their customer service team at 1-888-279-5001 or using their online support resources for assistance.