1. Asking the caller to wait:
1.1. Just a moment, please.
1.2. Hold the line, please.
1.3. Can/Could you hold, please?
2. Telling the caller he/she will be connected:
2.1. I`ll put you through.
2.2. Putting you through.
2.3. You`re through now.
2.4. Trying to connected you.
2.5. I`m still trying to connect you.
3. Saying someone is not available:
3.1. Sorry, the line`s busy at the moment.
3.2. His/Her line`s engaged, I`m afraid.
3.3. I`m sorry, there is no reply.
3.4. I`m not getting any reply.
3.5. Would you like to hold?
3.6. I`m afraid Jack`s busy just now.
3.7. He/She will call you back in five minutes.
3.8. Shall I try someone else for you?
3.9. Can someone else help?
3.10. Shall I ask him/her to call you back?