You will learn, from conversation, that Vendy is in love with the Microwave (Called Microsurf Model 8/9), located in the kitchen on the ground floor. Vendy wants proof that the Microwave loves her back.

Despite that Vendy is a machine, they appeciate the same Tokens of Affection that a human might.

You'll find it somewhere in the Mosse Family residence. What have you found that could make a romantic gift?

There is a Rose to the right of the Edu-Tron.

You could try taking the Rose to Vendy.

Vendy doesn't believe it is from the Microwave.

How would Vendy know that the Microwave (sepcifically, and no-one else) sent the Rose to them?

Use the Rose on the Microwave (which is found in the kitchen on the ground floor). The Microwave will cook it and Vendy will now know who it is from.

Take the cooked Rose to Vendy.

Vendy will give you the Vox Recorder and you need to put it into Echo-Bot, in Henry's bedroom.