Not able to install ansible on amazon rhel7.4 suing epel7 package.

I’m trying to install ansible on amazon rhel7.4 using Epel7 but it is throwing error saying that ansible package is not available. can anyone help me out to solve this problem.
last month it was working fyne but today when i tried to install, it is throwing error.

From the documentation (http://docs.ansible.com/ansible/latest/intro_installation.html#latest-release-via-yum):

We’ve changed how the Ansible community packages are distributed. For users of RHEL/CentOS/Scientific Linux version 7, the Ansible community RPM package will transition from the EPEL repository to the Extras channel. There will be no change for version 6 of RHEL/CentOS/Scientific Linux since Extras is not a part of version 6.

The Ansible packages moved to the Extras repsitory for RHEL 7 and are no longer in EPEL. See the installation docs for details.