In case of a table with no guest, it will ask for pax

bookie/src/app/sales/pax/pax.component.html

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+<mat-dialog-content>
+  <form [formGroup]="form">
+    <div fxLayout="row" fxLayoutAlign="space-around start" fxLayout.lt-md="column" fxLayoutGap="20px"
+         fxLayoutGap.lt-md="0px">
+      <mat-form-field fxFlex>
+        <mat-label>Pax</mat-label>
+        <input type="text" matInput #quantity placeholder="Pax" formControlName="pax" autocomplete="off"
+               (focus)="quantity.select()" cdkFocusInitial>
+      </mat-form-field>
+    </div>
+  </form>
+</mat-dialog-content>
+<mat-dialog-actions>
+  <button mat-button [mat-dialog-close]="false">Cancel</button>
+  <button mat-button (click)="accept()" color="primary">Ok</button>
+</mat-dialog-actions>

bookie/src/app/sales/pax/pax.component.spec.ts

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { PaxComponent } from './pax.component';
+
+describe('PaxComponent', () => {
+  let component: PaxComponent;
+  let fixture: ComponentFixture<PaxComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ PaxComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(PaxComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

bookie/src/app/sales/pax/pax.component.ts

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+import { Component, Inject, OnInit } from '@angular/core';
+import { MAT_DIALOG_DATA, MatDialogRef } from '@angular/material';
+import { FormBuilder, FormGroup } from '@angular/forms';
+
+@Component({
+  selector: 'app-pax',
+  templateUrl: './pax.component.html',
+  styleUrls: ['./pax.component.css']
+})
+export class PaxComponent implements OnInit {
+  form: FormGroup;
+
+  constructor(
+    public dialogRef: MatDialogRef<PaxComponent>,
+    @Inject(MAT_DIALOG_DATA) public data: number,
+    private fb: FormBuilder,
+  ) {
+    this.createForm();
+  }
+
+  ngOnInit() {
+    this.form.setValue({
+      pax: this.data
+    });
+  }
+
+  createForm() {
+    this.form = this.fb.group({
+      pax: ''
+    });
+  }
+
+  accept(): void {
+    const pax = this.form.value.pax;
+    this.dialogRef.close(pax);
+  }
+}