MessageParser.js

class MessageParser {
  constructor(actionProvider, state) {
    this.actionProvider = actionProvider;
    // State represents the chatbot state and is passed 
    // in at initalization. You can use it to read chatbot state
    // inside the messageParser
    this.state = state
  }

  parse = (message) => {
    const lowerCase = message.toLowerCase();

    if (
      lowerCase.includes("messageparser") ||
      lowerCase.includes("parse") ||
      lowerCase.includes("parser") ||
      lowerCase.includes("message parser")
    ) {
      return this.actionProvider.handleMessageParser();
    }
    return this.actionProvider.handleDefault();
  };
}

export default MessageParser;

...
  parse = (message) => {
     let toCheck = ['messageparser', 'parse', 'parser', 'message parser'];
    const lowerCase = message.toLowerCase();

    if (toCheck.some((item) => lowerCase.includes(item))){
      return this.actionProvider.handleMessageParser();
    }
    return this.actionProvider.handleDefault();
  };
}

...

you can make these changes to make it more simpler

if we have one string inputs from the user in the text field, but it can be for search flight or for search airport, how will we distinguish and parse and call the API according? Also, can we read the input text field and previously selected options together and check?

Thank you