Help me! Choose the correct from of the verbs.There were however a number of administrative problems. When we arrived/had arrived, we discovered/had discovered that the hotel manager reserved/had reserved the wrong room for us ...

Help me! Choose the correct from of the verbs.There were however a number of administrative problems. When we arrived/had arrived, we discovered/had discovered that the hotel manager reserved/had reserved the wrong room for us and therefore we didn't have/had not had enough space. Unfortunately, he couldn't let us have the larger room because he gave/had given it to another group, even bigger than ours.He also misunderstood/had also misunderstood the letter explaining what food we required/had required. In fact, we suspected/had suspected that he lost/had lost the letter. We don't recommend using this hotel again.