I am a student.
I received a request for a letter of recommendation to a professor for some award. I know for a fact that my letter will be directly used in the application for the award. [I have since graduated from this institution.] I haven't interacted with this particular person in about 3-4 years, and feel that I couldn't write the strongest one, since my interactions with this person were not much outside of classwork (two classes).
It looks like someone else is requesting these letters; how do I politely reject the request? I am particularly not interested in burning any bridges, since I may consider getting a career in academia in the future, but I haven't asked this particular professor for any recommendations (nor do I plan to do so in the future).
Update: I have decided to write the letter. Appreciate all of the feedback here.