Thanks for the document but this is not correct format required by consulate .
Here I am sending one sample invitation letter Which last time I got for my US trip , you have to make similar
The expense line you have to remove.
Passport detail and all information are correct in the attached letter and belonging to me only.
I will reach Bangkok on 27th Jan 2015 morning and return by 31St Jan 2015 , you may put from 27th Jan 2015 to 2Nd Feb 2015.
This letter will be addressed to
The Royal Thai Consulate General –Chennai
India.