Update Sharepoint empty rows with unique ID

[GPronnya]

Hello All, I am new to Flow, but I have I think simple task to solve, which I don't know how.

Let's say I have 100 tickets to a concert. Each ticket has unique number from 1 to 100.

I would like my colleagues to apply for free Ticket via FORMS. Then it needs to go for approval of my boss. 

Once it is approved, I want form responses to be put or assigned under any unique ticket. So afterwards an e-mail can be send to applicant that he was granted with ticket

[Jcook]

Hi @GPronnya 

Are these tickets already inside a SharePoint List?

[GPronnya]

@Jcook Technically the list with tickets will be uploaded, or Excel file. 

Basically I want system to update Item or Row with any ID (number of ticket) if next cells in row are empty.

Would you like a visual of my idea?

Thank you in advance,

[Jcook]

Hello @GPronnya 

Sorry for the late response,,

Yes a visual would be awesome.