SMS Twilio

How to use form field as part of text message, I am able send text message successfully, but I need the License_Expire_Date field as part of text. when use this script below the message does not go through, but replace the License_Expire_Date with sample text message it does work. Thankful for any help.

This works

var = input.Phone_Number.toString();

var1 = "+1" + var;

//info var1;

resp = twilio.sms.send("Driverlync",var1,"DL EXPIRED");

info resp + "Response";

This doesn't work

var = input.Phone_Number.toString();

var1 = "+1" + var;

//info var1;

resp = twilio.sms.send("Driverlync",var1,License_Expire_Date);

info resp + "Response";