Past narratives (1)

Past simple or past perfect?

Put the verbs in brackets into the correct past form
Conference Report
(Parkhouse Hotel 5th September)

The conference was very successful. The seminars and talks (be) extremely interesting and it was obvious that all the speakers (prepare) their material very thoroughly. Everyone agreed that this should become an annual event.
There were however a number of administrative problems. When we (arrive), we (discover) that the manager (reserve) the wrong room for us and therefore we (not have) enough space. Unfortunately, he could not let us have the larger room because he (give) it to another group, even bigger than ours.
He (also / misunderstand) the letter explaining what food we (require). In fact, we (suspect) that he (lose) the letter. Consequently, we do not recommend using this hotel again.