From Left toolbar, click on Promotion.
Click on Auto-Sequence from Promotion drop-down.

Create an Auto-Sequence from the Center button.

Give Name to your sequence and select the Trigger time.

There are 3 options:
After Initial Conversation: Your auto-sequence will be sent to the user after the initial conversation.
After User Added to Segment: Your auto-sequence will be sent to the user added to any segment.
After Last Conversation: Your auto-sequence will be sent to the user after the last conversation.
I have selected: After Initial Conversation. Enter Save.

You will be directed to the new window like this:

If you have Message list, you can select the relevant message on which you want to send Auto-Sequence or Create Message from the center button.
Set the timings on which you want to send your auto-sequence.

You can select the Days, Hours and Minutes on which you can send the message.

In this scenario, the user skipped giving the details. We have set auto-sequence in a way that if the user doesn’t give you details, you can send the reminder by asking “Kindly give your details”

Note: Auto-Sequence can only be used in Facebook Messenger Bot.