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I have small H.W ( Writing a sample recommendation letter )
Please, could you correct my writing grammatically  
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This letter is written to express our complete satisfaction with the services provided by Nana, She was employed in Heath center of Miami hospital as a LAB TECHNICIAN from 3-5-2005 to 1-7-2006 and rotated the following sections:

1-Hematology

2-Chemestry

3-Parasitology

4-Microbiology

         Nana did an excellent job in this position and has ability to work under pressure. She was a good asset to her group members in the laboratory. Her strong interpersonal and communication skills with the group members at the hospital and the patients have allowed her to develop good working relationships.

During her tenure, we found her to be hard working, ambitious, patience and sincere. Her services were found to be extremely satisfactory. I eagerly give my endorsement of Awatif”s skills and professionalism without qualification and with the highest praise.

We wish her all the best and success in her future endeavors.

please do not hesitate to contact me.

Best Regards,
Ronald Weaver                                
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Hi,

A small further comment.

Is her name 'Nana' or 'Awatif'? Or both?

Let's assume her name is Nana Awatif.

Begin by referring to her as Nana Awatif, or 'Ms Awatif'.

In later sentences, my advice would be to continue with 'Ms. Awatif'.

Simply 'Nana' can seem too informal. More importantly, male employers will often be seen as paternalistic if they refer to women employees exclusively by their first names in such a letter. It can be seen as treating women in a child-like and patronizing manner,

Clive
Comments  
This letter is written to express our complete satisfaction with the services provided by Nana. She was employed in the Heath ("Heath" like someone's name, or "Health"?) center of Miami Hospital as a LAB TECHNICIAN from 3-5-2005 to 1-7-2006 and rotated through the Hematology, Chemistry, Parasitology, and Microbiology sections.

Nana did an excellent job in this position and has the ability to work under pressure. She was an asset to her group members in the laboratory. Her strong interpersonal and
communications skills with the group members at the hospital and the patients
have allowed her to develop good working relationships.

During her tenure, we found her to be hard working, ambitious, patient and sincere. Her services were found to be extremely satisfactory.

I eagerly give my endorsement of Awatif”s skills and professionalism without qualification, and with the highest praise.

We wish her all the best and success in her future endeavors.

Please do not hesitate to contact me if you have any questions.

Best Regards,
Ronald Weaver
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 Clive's reply was promoted to an answer.
Thank you so much letmecheckthat and Clive, your comments are very helpful.
I will correct the names : ) thanks so much

During her stay we found her sincere, hardworking and result oriented. She worked well as part of team during her tenure. We take this opportunity to thank her and wish her all the best for the future endeavors.

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