Hey there Monica,
Welcome to planDisney and thank you so much for your question! It's always a pleasure to get to answer questions from a fellow Arizonan.
Currently, to visit one of the parks of the Disneyland Resort, you need both valid
theme park tickets and a
theme park reservation for each day you plan to visit. Therefore, once you purchase tickets then they're good to use on any day that there are available theme park reservations until their expiration date, which is typically a year or more out from the purchase date.
The theme park reservations, on the other hand, are subject to availability and are needed to actually visit a park on your scheduled day. You can check the theme park reservation availability calendar for both
multi-day tickets and
single-day tickets to get a sense of what is available.
Looking at both calendars for March 7th and 8th, it looks like both Disneyland Park and Disney California Adventure Park still have reservations available.
It sounds like you may not have purchased your tickets yet, so my recommendation would be to visit the
theme park tickets purchase page on the Disneyland Resort website, choose "2" under the "Select the Number of Days" option, and follow the rest of the purchase prompts through the payment screen. I just tried this on my end and was able to make theme park reservation options for both dates just fine!
If you're still having an issue then I'd recommend
reaching out to a Cast Member at the Tickets line who can better help you with the specific details of your situation.
Thanks again for your question, Monica! I hope you have a fantastic trip to the Happiest Place on Earth in just a few weeks.
Have a Magical Day,
Greg