I really had a fantastic time and learnt so much along the way. The team was very helpful and supportive; they made me feel like I am part of the team.
You have gained enough and valuable experience in the company that you can talk about how grateful you are for having had the position. Include the valuable things you learned.
The staff team have been very supportive and I would highly recommend this as a placement. Before deciding on a gratuitous move, assess your intention bases on certain circumstances that could possibly lead you to writing thank-you letters. I have developed practical, key skills that will be invaluable in future practice.
Even if you did not have a good experience, look for the one thing you learned that will help you later in your career, and mention that.
Donation — Whether in cash or in kind, always acknowledge donations through writing. I have really felt welcomed by the team. Hopefully, you've gained valuable experience through this internship and can speak about why you are grateful for having had the position.
You can talk about a favorite moment, something valuable or interesting you learned, or a new, eye-opening experience or awareness you've achieved. You have all been very friendly and welcoming and I believe that my OT skills have really benefitted since coming here. Writing thank you letters for mere acknowledgement of efforts without asking anything in return should be deemed noteworthy.
The interview opportunity itself is already something to be grateful for despite other possibilities with regard to your employment.