Hello angel, and welcome to our forum.
Generally we suggest people write down what they would say if they were speaking to the person in person.
Something like "Thank you for your interest in ABC Security Services" is a good start.
If there are various levels of service and a different quote for each one, make sure you are very clear about what is what. You may want to use a table or bullets.
Write your best attempt and post it here.
Student or Learner