Rendez-vous toujours service a vos amis quand ils vous le demandent?

answering no, respond to the question using an indirect pronoun.

the pronoun is leur but i am not sure where to place it and is the conjugation for je, je rende??

Non je ne leur rends pas service.

No, je ne leur rends pas toujours service quand ils me le demandent.

To place the indirect pronoun "leur" correctly, it should be positioned before the conjugated verb "rends." The correct conjugation for the verb "rendre" in the first-person singular (je) is "rends," not "rendre."