No doubt, people overreact about X today, Y tomorrow, Z in a week... we're oversensitive now a days.
Sending a text message saying: "Hi, I'll be back in town XX to XX, name" shouldn't not be cause for drama yet unfortunately could be if the client has nothing else going on and would like to feel he finally got a stalker in his life, a dream came true....
I agree with @Strafe13 I have no problems on someone I couldn't see in my home town contacting me on his next trip sending me a simple text.