How to turn down a guy’s lunch invitation

We lie.

[12:02:41 PM] sharon says: he just called
[12:02:42 PM] sharon says: hahaha
[12:02:44 PM] Melissa Ng says: he called me
[12:02:45 PM] Melissa Ng says: sheet
[12:02:45 PM] sharon says: and i told him i got appt
[12:02:49 PM] Melissa Ng says: sheet sheet sheet
[12:02:53 PM] Melissa Ng says: so awkward
[12:02:54 PM] sharon says: oopsss
[12:02:56 PM] sharon says: so how?
[12:02:58 PM] Melissa Ng says: i told him im not meeting you
[12:02:59 PM] Melissa Ng says: hahahahaha
[12:03:01 PM] sharon says: ok
[12:03:02 PM] Melissa Ng says: told him i got lunch meeting
[12:03:04 PM] Melissa Ng says: so nvm la
[12:03:07 PM] sharon says: i just told him i got appt
[12:03:08 PM] Melissa Ng says: screw that dude
[12:03:14 PM] Melissa Ng says: thank God he wont be staying long
[12:03:15 PM] Melissa Ng says: phew
[12:03:21 PM] Melissa Ng says: bleah
[12:03:22 PM] sharon says: we cant possibly include him in all our lunch appts rite?
[12:03:24 PM] sharon says: haha
[12:03:30 PM] sharon says: he also not our close friend

And for really no reason whatever, why should we care?