I went there for a purpose of meeting and sat on t...

I went there for a purpose of meeting and sat on the very first Couch as I was waiting for the person whom I was supposed to meet.
And after 15 minutes this guy came and asked me May I help you and replied I'm waiting for someone he said this is not waiting area and asked me move forward to front are where there was no shade,
I was there for a purpose and neither I look so irrelevant in my casual dressing then why can't one can just sit there.