How to create async.auto-like promises chain?

Here is the code I have:

async.auto({
    client: service.findCLient,
    existingChat: ['client', service.findChat],
    chat: ['client', 'existingChat', service.createChat]
}, (err) => {
    if (err) return service.handleError(err);
    service.emitChatEvent();
    service.editMenu();
});

What is the best way to handle it by using Bluebird Promises?