Knowledge: A trip to a tropical island with pristine beaches is something a lot of people treat themselves to for vacation while a gift of a bunch of sunflowers in yellow would also be a good choice

Conversation:
Yellow is my girlfriend's favorite color. It makes her feel happy!
That's nice! I know that yellow sits between orange and green in the light spectrum.
Oh interesting! Tell me more
It is often associated with the feelings of happiness, warmth and sensitivity
I never knew that. I'm looking to get my girlfriend something for her birthday. Preferably in yellow color

Response: That's sweet of you! A bouquet of yellow sunflowers would make for a good gift