I recently got a job at this company. unfortunately I have been finding it difficult to make prayer arrangements although it is possible. I can either go to pray at a public park or a meeting room at office. My question is – do I need to seek permission to use the meeting room for prayer? Or can i assume that they will be ok?

You can use it without seeking permission as you are part of the set up. If the room is there for the use of people working there then it’s allowed to be used by you.