cant delete bootcamp partition

[GUNGAABAYAR]

I have iMac with 2TB Fusion drive El Capitan 10.11.3 installed on it.
Tried to install windows 10 pro using bootcamp assistant and messed up during the installation. Cos the installation stuck on choosing drive on which w10 is supposed to install. Deleted the partition and created another one during the windows 10 installation process. and failed. So tried to delete the partition using diskutility but failed again. below is the list of current disk layout.

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 121.0 GB disk0s2
3: Apple_Boot Boot OS X 134.2 MB disk0s3
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *2.0 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_CoreStorage Macintosh HD 1.4 TB disk1s2
3: Apple_Boot Recovery HD 987.9 MB disk1s3
4: EFI NO NAME 104.9 MB disk1s4
5: Microsoft Reserved 16.8 MB disk1s5
6: Apple_HFS BOOTCAMP 500.9 GB disk1s6
/dev/disk2 (internal, virtual):

#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +1.6 TB disk2
Logical Volume on disk0s2, disk1s2
CEBD8FE2-2D4F-440A-830C-70AD7D88C74F
Unencrypted Fusion Drive



Following is diskutil CS List

CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group CE8C8136-3FC1-49EE-8271-E11B1358F4E5
=========================================================
Name: Macintosh HD
Status: Online
Size: 1567616471040 B (1.6 TB)
Free Space: 585728 B (585.7 KB)

+-< Physical Volume 8F83AB6A-8E82-4E02-A6F1-FDB3485E7D9F
| ----------------------------------------------------
| Index: 0
| Disk: disk0s2
| Status: Online
| Size: 120988852224 B (121.0 GB)
|
+-< Physical Volume A68AE373-AE41-4BCF-860B-1F619A6534CE
| ----------------------------------------------------
| Index: 1
| Disk: disk1s2
| Status: Online
| Size: 1446627618816 B (1.4 TB)
|
+-> Logical Volume Family 64521696-624E-451C-A4A9-23A1954DB3E6
----------------------------------------------------------
Encryption Type: None
|
+-> Logical Volume CEBD8FE2-2D4F-440A-830C-70AD7D88C74F
---------------------------------------------------
Disk: disk2
Status: Online
Size (Total): 1561760628736 B (1.6 TB)
Revertible: No
LV Name: Macintosh HD
Volume Name: Macintosh HD
Content Hint: Apple_HFS
LVG Type: Fusion, Sparse


How can I delete the logic disks (or partition) numbered 5 and 6 on above list. tried on disk utility on restore mode (CMD R start) and still no luck

many thanks in advance
DG