Can you please send me a sample for a cover letter asking for a informational interview — one that will get me in the door.
You are on the right track by asking. An informational interview should be an integral part of your networking and job-hunting plan. An informational interview involves talking with people who are currently working in the field to gain a better understanding of an occupation or industry – and to build a network of contacts in that field.
You can find a sample cover letter in the Quintessential
Careers Informational Interviewing Tutorial.