Hi there sathya17,
If you haven't already, you can see if restarting your iPhone 14 Plus may help the results you are getting with Siri. Restarting can seem like a simple step, but it can refresh the iOS and sometimes resolve unexpected issues. If needed, the article below shows how:
How to restart your iPhone X, 11, 12, 13, or later
1. Press and hold either volume button and the side button until the power-off slider appears.

2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo.
Those steps can be found in this article: Restart your iPhone - Apple Support If you've already tried that or if the issue continues, you'll also want to ensure that your iPhone 14 Plus is running the latest version of iOS, as that can sometimes help resolve issues too. If needed, this article shows how to backup and update: Update your iPhone or iPad - Apple Support
Please let us know how those steps go or if you've already tried those.
Take care.