Custom WordPress Plugin

I need a custom WordPress Plugin with the following functionality: Outline Plugin required to allow customer to chose an offer, make a reservation and pay. Data needs to be held in admin view to allow admin to confirm/amend bookings. After action, customer receives confirmation email. Think of a light version of an airline site! Requirements - Offer to be set up in plug in (price, etc) - calendar required for customer to pick "wish date" - personal details need to be recorded - email confirmation / automation - needs to work with external payment gateway - needs to support WPML Language Plug-In Other Site already set up, CSS and styling will be done by me, so only coding is required.