ChatBot For Customer Service Line of Business to Resell to the Travel Industry

I am looking for a skilled developer to build a ChatBot for my customer service line of business that can be resold to the travel industry. The platform for building the ChatBot is flexible, and I am open to finding the best option for my needs. The ChatBot must have 24/7 availability to handle customer inquiries, and it should be able to support multiple languages. The platform will need to have the ability to escalate to a live agent with possible integrations to salesforce email system. The ideal candidate should have experience in building ChatBots and be able to provide examples of their previous work.