1. Hello? Serena speaking. ( when the caller is unknown)
2. Ram Gupta speaking. Who's calling, please? ( when the caller is unknown)
3. Doctor Sinha's office. May I know who's calling, please? ( when the caller is unknown)
4. Thank you for calling Geeta. Shashi speaking.
5. Hello Asha. Nice to hear from you.
6. Hello Dr Singh. How can I help you?