Calendar Reservation System for Tours on an existing website

Our company does walking tours, and we would like to include a calendar reservation(booking) system for clients on our existing website. The reservation system would require the following features: - monthly views of tour options - daily views of tour options - a back end system for adding/subtracting tours - a back end system for changing the number of people allowed per tour(setting a tour limit) - the ability for clients to purchase their tour - clients will be able to choose from an adult or child option - emails will be sent to us after people make reservations - emails will include the name of the person making reservations and party size - buyer data is collected and retained for future contact(email, address, etc.) - buyers may input notes about special needs, etc. - a reminder email and receipt is sent to buyers with where to meet, what to wear, etc. Please send a copy, demo, or link of previous calendar reservation systems created. Thanks, Zack