I have finally booked the air tickets to Chengdu with Silkair, traveling from 30 Nov to 14 Dec.

I have requested Sim's Cozy Travel to help me arrange the permit to Tibet and train tickets. I hope to take the 1 Dec departing train. But I am just told that I need a Visa or Entry Stamp before the agency could apply a permit. As we Singaporeans do not need Visa, I am now stuck with a situation. I may need to stay in Chengdu for many more days than I actually planned for.

Any suggestion?