Reasoning: """
The notes_6-1-2023.txt file mentions the upcoming hiring round and preparing for interviews, but does not seem to contain the specific notes about how to properly conduct interviews that David is looking for. 

I will continue checking the other meeting notes files from January to March 2023 to see if I can find a file with more detailed interview guidance.
"""

Action: open_file
Argument: meeting_notes/notes_20-1-2023.txt