{% if owner %}

Your Booking Is About to Expire.

Your booking will expire within 48 hours ({{booking.end}}).

{% else %}

A Booking That You Collaborate on Is About to Expire.

The booking owned by {{booking.owner.username}} that you work on is about to expire.

{% endif %}

Please take the time to backup all data or extend the booking if needed.

{% for user in booking.collaborators.all %} {% empty %} {% endfor %}

Booking Information:
Owner:	{{booking.owner.username}}
id:	{{booking.id}}
lab:	{{booking.resource.template.lab.lab_user.username}}
resource:	{{booking.resource.template.name}}
start:	{{booking.start}}
end:	{{booking.end}}
purpose:	{{booking.purpose}}
collaborator{% booking.collaborators.all.count|pluralize:"s" %}:
	{{user.username}}
	No collaborators

You can find more detailed information here