How to call a confirmation box from a service on ionic 4?

Ionic Native
1

Hello please help me I work on an application with ionic 4 but I’m facing a problem my code, here is what I did in my provider file DialogService.ts

 confirmDialog(tilte: string, msg: string): Promise<boolean> {
        return new Promise((resolve, reject) => {
            const confirm = this.alertController.create({
                header: tilte,
                message: msg,
                buttons: [
                    {
                        text: 'Annuler',
                        role: 'cancel',
                        cssClass: 'secondary',
                        handler: () => {
                            confirm.dismiss().then(() => resolve(false));
                            return false;
                        }
                    }, {
                        text: 'Confirmer',
                        handler: () => {
                            confirm.dismiss().then(() => resolve(true));
                            return false;
                        }
                    }
                ]
            });

            return confirm.present();

        });
    }

and I execute it like this

 this.dialogServ.confirmDialog('Passer une nouvelle commande?', 'Il n\'est paspossible de commander chez 2 restaurant a la fois').then((yes) => {
                if (yes) { 
                }
            });

But I still have the following errors in my command prompt

[ng] ERROR in src/app/pages/cart/cart.page.ts(27,90): error TS2304: Cannot find name 'UserP'.
[ng] src/app/services/DialogService.ts(32,37): error TS2570: Property 'dismiss' does not exist on type 'Promise<HTMLIonAlertElement>'. Did you forget to use 'await'?
[ng] src/app/services/DialogService.ts(38,37): error TS2570: Property 'dismiss' does not exist on type 'Promise<HTMLIonAlertElement>'. Did you forget to use 'await'?
[ng] src/app/services/DialogService.ts(45,28): error TS2570: Property 'present' does not exist on type 'Promise<HTMLIonAlertElement>'. Did you forget to use 'await'?

Help me please