Hello bharathi291,
Thanks for choosing the Apple Support Communities. This is an indication that a messages failed to send. If you open the Messages app and see that all messages have successfully sent, let's try these steps to resolve the issue.
- Close the Messages app and re-open - Close an app on your iPhone or iPod touch - Apple Support
- Restart your iPhone - Restart your iPhone - Apple Support
- Force restart your iPhone - Force restart iPhone - Apple Support
Give those a try, and let us know if they help.
Cheers!