Are you responsible for the unexpected events that occur at your front desk?

Always someone must be prepared for any unexpected situation.

I cannot say totally I’m responsible for unexpected events which occur in an office but if there is in the lack of my monitoring at that time I should be responsible.

In my opinion (this situation shows how important to have the sense of Customer Service and Problem Solving even for non customer service positions).
The professional employee - despite from his position - who can handle his front desk client without involving him about the internal matters of his organization.
Because in most of the cases the client does not know/care who was the guilty, Whether it is Account, HR, Customer Service or Operation ..etc.
The main thing just to have his subject sorted out ASAP at any cost.
So the best way is to show him that he is valuable to the company, then collect enough information and get back to him as soon as the issue solved (depends on the case if it can be solved same time or later on - in last case you have to inform and commit to the customer that you would get back to him soon with a radical solution without involving him about your internal issues).
I am sure, this behaviour would leave a good impression to the client that this company is hiring a good staff who can arrange everything ASAP without going thru a long procedures.
Regards,

Yes i should be but the working hour should be in my supervision.

When it comes to event management, one must always be ready for the unexpected.
For that, any situation that comes along should be handled with full responsibility and brave heart.

Yes, I am certain I can be.