Goal: I want to reply to Amelia Miller's email that "Sorry to say, but I'm not able to come to this event" in the Gmail app.
Steps:
action: action_type: click
step_instruction: Click on the Amelia Miller to view the reply option of this email.
action: action_type: click
step_instruction: Click on the Reply option to reply this email.
action: action_type: input_text
text: Sorry to say, but I'm not able to come to this event
step_instruction: Type Sorry to say, but I'm not able to come to this event. in the body of this email. 
action: action_type: click
step_instruction: Click on the send button at the top right corner of the screen to send the reply of this email.