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Branch Nodes are nodes that you can use to create loops and create if statements inside the dialogue file itself without needing to make logic with code.

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Set Flags

Another way could be to set some flags through code like bought two items out of a three item pool:
And the code for it would look something like:
For more info on Flags, check FlagHandler.

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Loops

You can create a loop in your dialogue using a branch node by having it keep rechecking a flag until it is true, here are several ways you can use this:

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Item Validation

You could also have a person keep saying something or an action keep getting repeated if for example the player is missing an item!
And the code would be a simple SetFlag("is_wearing_armour") before running the dialgoue.

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Hanging Dialogue

You could also make a dialogue hang until something happens, instead of quitting the dialogue, simply set a flag that would hide the UI, and have the player do something. For example we could make a character refuse to continue a dialogue before the player talks to another character.
And the code would only need to call SetFlag("asked_monica") when the player interacts with the character named Monica, then hiding the UI.As you can see, while the building blocks are simple by design, they open a lot of possibilites and allow for some fairly versatile options.For more info on branch nodes, see Reference: Branch Node.