It happened between 23:00 and 00:00 on Saturday 20 July and involved a man and a woman.
The woman was injured during the incident, which took place on the pavement somewhere between Mora and The Candy Shop.
The man involved has been described as a white male in his mid-thirties. He was wearing a dark blue long-sleeved shirt and dark jeans, with brown hair and a ‘local accent’.
He is believed to have been with a group of male friends at the time.
The woman was wearing a long yellow skirt and dark cardigan.
Anyone who thinks they may have information for the police can contact the station on 725111 or Crimestoppers anonymously on 0800 555 111.