Chatbot Development in Java, Python, PHP - Which Platform is best for you?

I am a developer and get a requirement of chatbot development but there is a confusion that which programming language will be suitable among Java, Python and PHP for the platform?

As chatbot is in high trend and i am also opting for the chatbot development service but am confuse among the programming language Java, Python and PHP. Can you suggest me which will be the better?

Chatbot development helps automatize such routine tasks as customer support or bill payment. Enterprises as Starbucks, Amazon, and Facebook have already integrated chatbots into their products to offer customers a better experience.