Hi
Use read text file activity and get the output as a string named Strinput
Now use a assign activity like this
Strinput = Strinput.ToString.Replace(“_Name”,”your new word”).Replace(“TicketNumber”, “your new number”)
If you want to make it dynamic u can place a placeholder in those places in the text file
Refer this for more idea on that
Cheers @Kumar_Sahu_Sameer