Unable to login to postgresql version 9.6

Hi,
I have uninstalled postgresql version 9.3 and installed 9.6 version but even after uninstalling 9.3 version, i am able to see older database which i have created in 9.3 version.
When i give psql -U loraserver_as -d loraserver_as -h 127.0.0.1 -W command am logging into postgresql version 9.3 database.
When i try to login to database which i have newely created in 9.6 version am getting below errors even after entering correct password.

Password for user loraserver_app:
psql: FATAL: password authentication failed for user “loraserver_app”
FATAL: password authentication failed for user “loraserver_app”