Unique subject from contact forms

I have a contact form on my website (version 7.1) 
I like to keep all my emails in a conversation thread in gmail, however in this version I can't make the subject line be unique to each client who contacts me.

I used to have the 7.0 version and putting Subject> "first and last name" in the text place holder area as the first line in the form worked. The emails would come in "Form Submission - contact - Clients name."  
This does not work in 7.1 

Is there anything that anyone has figured out to make this work?

2 hours ago, Beata said:

I used to have the 7.0 version and putting Subject> "first and last name" in the text place holder area as the first line in the form worked. The emails would come in "Form Submission - contact - Clients name."  
This does not work in 7.1 

I imagine that someone added some custom JavaScript code to your 7.0 site to add this functionality to the form. I say this because the forms on Squarespace 7.1 have the same features as those on Squarespace 7.0. They allow you to add custom text to the email subject by adding a text field with the label 'Subject' but it wouldn't include the text that you quoted. For this you would need custom code.

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Oh, that makes sense. Thank you.

My old website was set up by a friend, because I am quite computer illiterate.