Creating workflow using Office 365 application

Let's say I have three columns in my Sharepoint list - Col1(Text); Col2(Dropdown list); Col3(Text)
Now each time the value in the dropdown list changes I want to be able to trigger an email to the owner of the next item in the list.

For e.g., Col2 has following values -
1)Call-Initiated --> Here the email to the owner of the task and to the mentor will trigger
2)Call-Completed --> Here the email to mentor and owner of next item in the dropdown list will be triggered

We have access to all the Office 365 applications. Initially, I read about the Sharepoint Workflows; which can totally help with my requirement. But the workflow requires Sharepoint Designer which we don't have. We are able to access only online version of Sharepoint.

(1)Is there any way we can create a workflow on Sharepoint without Sharepoint Designer?
(2)Can we use any other MS apps which can fulfill the above requirement(also we should be able to export the data)?

Thanks!