How to get player id's from owners name? Pun network

so what i have is an object in the scene that sets the name of the player (the player sets their name say "Bob") and i get a string and int from a code the player enters in the chat, eg "/speed, 20"

and then i need to set an object that the player controls to the owners name, how do i do this?

what i have so far : commands script-

 using UnityEngine;
 using System.Collections;
 
 public class Commands : Photon.MonoBehaviour {
     private float i = 0.0F;
     private string name;
     GameObject player;
     RigidbodyFPSController controllerScript;
     // Use this for initialization
     public void Command(string com){
                 Debug.Log (com);
                 string[] splitstring = com.Split (',');
                 if (splitstring.Length > 0){
                         Debug.Log (splitstring [1]);
         }
         i = float.Parse(splitstring [1]);
         if (splitstring[0] == "/speed" && i > 0 || i < 1000 ) {
             Debug.Log(name + "" + splitstring[0] + " " + i);
             //controllerScript = player.GetComponent<RigidbodyFPSController>();
             //controllerScript.speed = i;
                 }
         }
     public void Player(string PlayerUserName){
         name = PlayerUserName;
         //player = PhotonView.Find (PlayerUserName);
         }
 }

Chat code-

 using System.Collections.Generic;
 using UnityEngine;
 using System.Collections;
 
 [RequireComponent(typeof(PhotonView))]
 public class InRoomChat : Photon.MonoBehaviour 
 {
     public Rect GuiRect = new Rect(0,0, 250,300);
     public bool IsVisible = true;
     public bool AlignBottom = false;
     public List<string> messages = new List<string>();
     private string inputLine = "";
     private Vector2 scrollPos = Vector2.zero;
     public Commands com;
 
     public static readonly string ChatRPC = "Chat";
 
     public void Start()
     {    
         if (this.AlignBottom)
         {
             this.GuiRect.y = Screen.height - this.GuiRect.height;
         }
     }
 
     public void OnGUI()
     {
         com = GetComponent<Commands>();
         if (!this.IsVisible || PhotonNetwork.connectionStateDetailed != PeerState.Joined)
         {
             return;
         }
         
         if (Event.current.type == EventType.KeyDown && (Event.current.keyCode == KeyCode.KeypadEnter || Event.current.keyCode == KeyCode.Return))
         {
             if (!string.IsNullOrEmpty(this.inputLine))
             {
                 if (inputLine[0] == '/'){
                     com.Command(inputLine);
                     this.inputLine = "";
                     GUI.FocusControl("");
                     return;
                 }
                 else {
                 this.photonView.RPC("Chat", PhotonTargets.All, this.inputLine);
                 this.inputLine = "";
                 GUI.FocusControl("");
                 return; // printing the now modified list would result in an error. to avoid this, we just skip this single frame
                 }}
             else
             {
                 GUI.FocusControl("ChatInput");
             }
         }
 
         GUI.SetNextControlName("");
         GUILayout.BeginArea(this.GuiRect);
 
         scrollPos = GUILayout.BeginScrollView(scrollPos);
         GUILayout.FlexibleSpace();
         for (int i = messages.Count - 1; i >= 0; i--)
         {
             GUILayout.Label(messages[i]);
         }
         GUILayout.EndScrollView();
 
         GUILayout.BeginHorizontal();
         GUI.SetNextControlName("ChatInput");
         inputLine = GUILayout.TextField(inputLine);
         if (GUILayout.Button("Send", GUILayout.ExpandWidth(false)))
         {
             this.photonView.RPC("Chat", PhotonTargets.All, this.inputLine);
             this.inputLine = "";
             GUI.FocusControl("");
         }
         GUILayout.EndHorizontal();
         GUILayout.EndArea();
     }
 
     [RPC]
     public void Chat(string newLine, PhotonMessageInfo mi)
     {
         string senderName = "anonymous";
 
         if (mi != null && mi.sender != null)
         {
             if (!string.IsNullOrEmpty(mi.sender.name))
             {
                 senderName = mi.sender.name;
                 com.Player(mi.sender.name);
             }
             else
             {
                 senderName = "player " + mi.sender.ID;
             }
         }
 
         this.messages.Add(senderName +": " + newLine);
     }
 
     public void AddLine(string newLine)
     {
         this.messages.Add(newLine);
     }
 }

thanks in advance