In this part you can read two examples of cover letters. You can use them as an inspiration and as a template for writing your own letter, although make sure to change the relevant information and correct them in order to match your qualifications and the requisites of the position. 
The first one is an example of a letter written by a person that already has a quite large experience in the sector, while the second one is a letter written by a student and can be taken as a model if you are also applying for one of your first jobs.
First example
[Name
  Surname
Address
City,
  State, zip code
Phone
  number 
Email
  address]
[Company
  Address
Company
  City, State, xxxxx
Telephone
  number
hiring.manager@xmail.com]
[Today’s Date]
Dear Mr./Mrs./Ms. [Hiring Manager’s Name],
Please accept my enclosed application for the
  position of executive assistant. I found your job posting on [Website Name],
  and I’m pleased to say that my skills match your requirements perfectly.
  According to your job posting, you need an experienced executive assistant who
  can schedule meetings, prepare agendas, and take care of daily issues without
  supervision.
In my current role as an executive assistant at
  PaxWay Incorporated, I handle all of these duties, and more, with great
  capability. Allow me to point to three bullet points from my resume that
  demonstrate both my abilities and achievements:
·                     Perform a variety of
  accounting activities, such as preparing between 10-20 check requests, expense
  reports, purchase orders, and invoices a week
·                     Handled all domestic and
  international travel reservations, cutting company’s travel expenses by 12%
·                     Organized 3+ monthly
  meetings and their logistical elements (scheduling, preparing the facility,
  organizing handouts and/or binders for attendees, etc.)
I also spearheaded the movement to “go digital,”
  which has proven to be a significant efficiency boon for the company. I am
  frequently praised for my ability to handle complex tasks and solve problems
  without requesting input, but also maintain an awareness of when input may be
  desired. In short, as an executive assistant, I am efficient, attentive, and
  competent. Finally, I have all the basic skills necessary for the role. I type
  at 80WPM, am familiar with CRM systems, and have a mastery of the MS Office Suite.
I am eagerly anticipating having a follow up
  conversation with you about how I can help make the lives of your company
  executives easier. Please feel free to contact me at any time.
Best,
[Your Name]
Available at: https://resumegenius.com/cover-letters-the-how-to-guide/administrative-assistant-cover-letter-samples#Executive
  
Second example
Joanne Tint
Email: joannetint@xmail.com
Mobile: XXX XXXX XXXX
Mr Allan Moyle
Moyle Retail Solutions
Phone: XX XXXX XXXX
Email: enquiries@moyleretailsolutions.com.au
23 April 2015
RE: Application for Casual Retail Sales Assistant position
Dear Mr. Moyle,
As a highly motivated and dedicated student with
  strong communication and interpersonal skills, I would like to apply for the
  position of Casual Retail Sales Assistant.
As a student I have been extensively involved in my
  school community, which has allowed me to develop strong interpersonal skills.
  My involvement in various events, including drama eisteddfods and sports
  carnivals, has allowed me to work closely with my peers while supporting the
  school community as a whole. 
These experiences have allowed me to develop strong
  time management and organisational skills, which I see as being very important
  when seeking to work in casual employment while continuing to study.
Personal attributes that I believe make me suitable
  for this position include:
Motivation:
  Volunteer participation and school results demonstrate high motivation. 
Customer
  Service: Assisting with the sale of products at community events has allowed
  the development of customer service skills. 
Communication:
  Acting in drama performances and working as an MC for school events has allowed
  the development of communication skills.
My teachers
  and educators have commended me for my willingness to participate and my
  dedication to helping out where possible. I enjoy working with others and
  believe that my strong communication skills will ensure that I can meet the
  expectations of this role.
I am aware
  that you will receive a large number of applications for this job, but I would
  very much appreciate the opportunity to demonstrate my capabilities to you in
  person. 
I believe that I have a lot to offer your
  organisation. I am keen to develop my professional skills and look forward to
  discussing my application with you at an interview. I have enclosed a copy of
  my resume for your consideration. I can be
  contacted at all times on the details provided above.
Thanking you in advance for your time,
Joanne Tint
Available at :
https://www.youthcentral.vic.gov.au/jobs-and-careers/applying-for-a-job/what-is-a-cover-letter/sample-cover-letters/cover-letter-no-work-experience