Dear Space travel enthusiasts:

     I'm proud and honored to hear that you'd like me to speak to your
group about the prospect of travel to other solar systems. As you all
know, my theory of relativity unequivocally states that as a body
approaches the speed of light, changes in time (as we perceive it)
approach zero. Therefore, travel to other solar systems is indeed
possible within one's lifetime, even if the destinations are thousands
of light years away.
I'd love to speak to your group sometime during the upcoming year. The
end of July looks best to me right now, but I might have some time in
June. Please keep me informed of your plans.

                               Sincerely,
                               