Translate the following English sentence to French:
"In my opinion, if a Member of the European Parliament is asked to put out his cigarette by an usher, it is his duty to acknowledge civilly that the usher is doing his duty and thank him for it."
Je considère que, si un député européen est invité par un huissier à éteindre sa cigarette, il a le devoir de donner acte courtoisement à l'huissier de faire son devoir et de l'en remercier.