No offer for me, instead the following invitation.
Hi Natalie,
We appreciate our customers feedback and would like to extend an invitation for you to take part in some market research for our xx_x store on Wednesday, 17 October 2012.
This involves being part of a group discussion with other customers and will run for 2 hours covering topics around your shopping experience in your local store, advertising and your general feeling and attitude towards grocery shopping at Woolworths. Register your interest and if selected to take part you will receive a $50 Gift Card for your time. Numbers are limited, so get in quick.
Will advise if I get selected.