How should one book Delta Airlines Reservations & United Airlines Reservations
While How should one get united airlines refund & change delta flight

Alternatively, you can also dial the cancellation number of Delta Airlines to speak to one of our agents who will do the cancellation process for you if you booked a ticket on the phone or visited our office via us.

Our staff is always able to assist you not only in canceling flights, but also in providing other facilities such as flight booking, seat reservations of your choosing, offering cheap flights, etc. 

You should dial our customer service number to get all sorts of trouble- free flight cancellation assistance from Delta Airlines. We're going to tell you how to save money on cancellations, too.

Link- United Airlines Reservations
Link- United Cancellation Fee

Delta Airlines Reservations & How to cancel or change delta flight

For most advance purchase tickets, Delta Air Lines will assess a fee for any voluntary re-routing or cancellations.

It is the duty of the travel agent to warn its customers/ticketed travelers of additional. Tariff collections, conditions and costs associated with these amendments.
For absolute cancellation and adjustment of charge restrictions or other potential exceptions, please refer to the individual fare rules.

Link- Delta Airlines Reservations
Link- Change Delta Flight