'How to leave space in SMTPLIB email body

How does one make sure that there is a space between every variable in a SMTPLIB email body?

This is what I have now:

 body = "We are very happy to confirm that,\n" + first_name + " " + second_name + "has booked an appointment on" + date 

The problem is that the first name and second are literally right next to each other in the email received and aesthetically it does not look good.



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