Need a booking bot for a chimney and ventilation duct cleaning service

We run a small chimney sweeping and ventilation duct cleaning company and need a booking bot built for our website and for Telegram or WhatsApp so customers can schedule a technician visit without calling us. The bot should ask what kind of object needs service — private house, apartment, cafe or restaurant, office, or industrial building — since the price and the equipment we bring depend on that. After the object type is chosen, the bot must show available dates and time slots for a master to visit, taking into account which district the client is in, because our technicians work by zones.

Besides scheduling, we want the bot to offer an optional diagnostic inspection as a separate step: a client can request a camera inspection of the chimney or duct before committing to a full cleaning, and the bot should explain that the diagnostic fee is deducted from the final price if the client proceeds with cleaning. Once the visit is confirmed, the bot needs to collect the address, a contact phone number, and any access notes (intercom code, floor, gate), then send a confirmation message and a reminder the day before the visit. Payment should be handled inside the bot: either an online card payment at booking or a note that the client will pay the technician in cash or by card on site.

Requirements:
— Step-by-step flow: object type, service type (cleaning or diagnostics), date and time slot
— Calendar with real technician availability by district/zone
— Address and contact collection with an access notes field
— Optional diagnostic inspection as a separate paid step, deductible from the cleaning price
— Online payment integration plus a cash/card-on-site option
— Automatic confirmation message and a reminder before the visit
— Admin panel or notification channel where staff see new bookings and can reassign a master
— Works as a widget on the website and as a Telegram/WhatsApp bot