Allowing one person to have 2 reservations at the same time

[RunjiaChen]

Description

Your UG states that one person cannot have one more than one reservation at the exact same time. However, I may able to do so once the edit function is called.

Steps to reproduce

1. Launch the application for the first time to load initial data.
2. Add a person
3. Make a reservation
4. Change the details of the person, not the contact or the name
5. Now you can make another reservation at the same time on the same date

Expected behaviour

Should not be able to accept 2 reservations made by the same person

Actual behaviour

2 reservations are actually possible for same time, same person

Reason for severity

Now you can have conflicting reservation details

Ideas

This may be caused by the edit function