Can You Be Charged or Convicted for Theft on Argument

Can I be charged or convicted of theft / pickpocketing if a person says i have pickpocketed his phone as his phone was there with him and when I left the place phone was not there with him saying I only have done it.And also I was the only one standing next to him at the store. Is it enough proof argument to convict and is this argument enough to prove beyond reasonable doubt

Can You Be Charged or Convicted for Theft on Argument