public async Task <LessonModel> PostAsync([FromBody] BookRequestModel model)
{
var userId = int.Parse(HttpContext.User.FindFirst(c => c.Type == ClaimTypes.Sid).Value);
var lesson = await _bookingService.AddLessonRequestAsync(model.OfferId, model.SlotIds, userId);
return(_mapper.Map <LessonModel>(lesson));
}