The Look up node finds a single row in one of your tables using that table's key, and puts it into the conversation for later steps to use.
Not found is not an error. It is how you tell a returning customer apart from a new one.
A match publishes the row's values by column name, plus timestamps:
{{variable}}.<column name>
{{variable}}.created_at
{{variable}}.updated_at
Table
table_key
Required
The table to search, and a value for each of its key columns.
This node stores its output in a variable that can be referenced in subsequent nodes using the {{variable}} syntax.
{{variable}}.created_at
string
When the row was first saved
{{variable}}.updated_at
string
When the row was last saved
found
not_found
error