no i don't think you are being unreasonable at all i like what stormy said it may be a better time for you .check it out first and then decide.

maybe it is your T's asst that is in charge of the schedule for the T and T may not even know at first that you were contacted and asked to do this again(i know it isn't always easy to hear other possibilities ,I'm practicing looking at other scenarios then the horrors in my head)T may have just said to asst this person needs to see me can you a place to fit this person in.
i hope you will be able to express this to T and maybe work it out