eka suraksita yatra hai
Mera bahut achha dost. That is how you say good friend in Hindi.
"shubh deepawali" is the way to say Happy diwali in hindi.
In Hindi, you can say "अलविदा" (Alvida) to say goodbye.
"Good morning" in Hindi is said as "शुभ प्रभात" (shubh prabhat).
"शुभ यात्रा" is the Hindi phrase for "Have a good trip."
Good morning can be said as 'SU PRABHAT' in Hindi. Here prabhat is morning.
"Have a good trip!" English is the official language of Australia.
Shubh Ratri
In India, "good-bye" can be said as "Alvida" in Hindi or "Namaste" as a more informal way of bidding farewell.
Maa Acchi hai
You can say "अच्छे वीकेंड की शुभकामनाएं" (acche weekend ki shubhkaamnaayein) in Hindi to wish someone to have a good weekend.