Answer:
Good afternoon / thank you very much for the information provided (for example), however, it is necessary that the missing information be provided to us before the end of the month (whatever the case may be) because in order to meet the objectives we need your collaboration . Sorry for the rush in the requested information, we need to meet the agreed date.
Explanation: In this case is important to speak in the plural so that the person who said the message feels committed and engage in conversation highlighting the positive things in the case, for example some information received or the ability of the person, so that they do not feel affected at the moment in which we request urgent information.
