VBA to analyse

Hello,

I am not sure if it can be done.. But what I am trying here is noted below.

1. I have string of data in Column N and Column O
2. If in Cell of Column N and Column O of same row has value #N/A, then I need adjustment cell P noted with " not available "
3. If in any one Cell of Column N and Column O of same row has value #N/A, then I need VBA to do noting.
4. If in both Cell of Column N and Column O of same row do not have value #N/A, then I need VBA to do nothing.?

My header start from Row 5.

Can it be done?

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Thanks