Response 1: It's locked, would you like me to unlock it?
A: No
R: Very well
Answer: Yes
Response: The front door is locked
Response 2: It's unlocked, would you like me to lock it?
Answer: No
Response: Very well
Answer: Yes
Response: The front door is now locked.
This will be fun, but it will be tricky to do it exactly as described. The easiest approach is probably more along the lines of:
Command 1: What's the status of the front door?
VC conditional response 1: The front door is locked
VC conditional response 2: It's unlocked, would you like me to lock it?
Command 2: (optional phrases "Yes"/"yes please") > lock the front door > (optional phrase "please")
VC response: The front door is now locked.
Command 3: "No" > "don't bother|thanks|nevermind"
VC response: Very well|As you wish|Whatever you like|OK, no problem.
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Note:
Command 3 in this case doesn't do anything "practical", it's just conversational fluff; but now you have a more flexible conversational fluff command that can work for multiple scenarios, not just this situation. However, you don't want the command phrase to be just "No" because then you'll be setting off the command constantly. As a general rule, it's best to avoid one-word commands in VC.
Command 2 in this case can now be used not just in the scenario you mention, but any time you want to lock your front door. Because you've added the optional yes/yes please in front of the phrasing, it will work for the script you describe as long as you also say "lock the front door," but it means that you don't have to use VC.TellVox with an "always confirm" door-locking command to make your script work (maybe you prefer to always have that command require confirmation, though?).
Again, it's best to avoid one word commands like "Yes", although it's true that you could use "yes" as your command confirmation phrase. Personally, I keep even my confirmation phrases a bit more unique to avoid headaches. The confirmation phrases that I have set in my Options are: "Yes please" "Affirmative" and "Go ahead".