i need how to write message in this vapi ai function module https://cdn.discordapp.com/attachments/1211484481848873020/1284846090818031687/Screenshot_2024-09-15_174326.png?ex=66e81dab&is=66e6cc2b&hm=043a0ae5aa04181745380ee4cb47a66a7663eb2213346b7265a513cb8ccb938a&